Just some quotes from Gospel Doctrine: the Sermons and Writings of Joseph F. Smith (Sixteenth Printing, Deseret Book company 1969). Nothing all that exciting today. =)
The Gospel Is Simple. (pg. 8-9)
Some subjects are in themselves, perhaps, perfectly harmless, and any amount of discussion over them would not be injurious to the faith of our young people. We are told, for example, that the theory of gravitation is at best a hypothesis, and that such is the atomic theory. These theories help to explain certain things about nature. Whether they are ultimately true can not make much difference to the religious convictions of our young people. On the other hand there are speculations which touch the origin of life and the relationship of God to his children. In a very limited degree that relationship has been defined by revelation and until we receive more light upon the subject we deem it best to refrain from the discussion of certain philosophical theories which rather destroy than build up the faith of our young people. One thing about this so-called philosophy of religion that is very undesirable lies in the fact that as soon as we convert our religion into a system of philosophy, none but philosophers can understand, appreciate, or enjoy it. God, in his revelation to man, has made his word so simple that the humblest of men, without special training, may enjoy great faith, comprehend the teachings of the gospel, and enjoy undisturbed their religious convictions. For that reason we are averse to the discussion of certain philosophical theories in our religious instructions. (Joseph F. Smith – Juvenile Instructor, Vol. 46, pp. 208, 209, April, 1911)
Our Knowledge is Limited. (pg. 9)
Our methods in speculation and reasoning about the things of God may often be harmless; but if we depart from the simplicity of God’s word into a spirit of rationalism, we become the victims of vanity, which endangers the true spirit of worship in the human heart. It is not easy for men to give up their vanities, to overcome their preconceived notions, and surrender themselves heart and soul to the will of God which is always higher than their own. The dangers of religious speculations are as great today as they were in the days of Christ, and if we would avoid these dangers we must adhere to the simplicity of our religious beliefs and practices. When men and women realize they are getting into deep water where their footing is insecure, they should retreat, for they may be sure that the course they have been taking will lead them more and more away from their bearings which are not always easy to regain. The religion of the heart, the unaffected and simple communion which we should hold with God, is the highest safeguard of the Latter-day Saints. It is no discredit to our intelligence or to our integrity to say frankly in the face of a hundred speculative questions, "I do not know."
One thing is certain, and that is, God has revealed enough to our understanding for our exaltation and for our happiness. Let the Saints, then, utilize what they already have; be simple and unaffected in their religion, both in thought and word, and they will not easily lose their bearings and be subjected to the vain philosophies of man. (Joseph F. Smith – Juvenile Instructor, Vol. 46, p. 269, May, 1911)
Theory and Divine Revelation. (pg. 38-39)
Our young people are diligent students. They reach out after truth and knowledge with commendable zeal, and in so doing they must necessarily adopt for temporary use, many theories of men. As long, however, as they recognize them as scaffolding useful for research purposes, there can be no special harm in them. It is when these theories are steeled upon as basic truth that trouble appears, and the searcher then stands in grave danger of being led hopelessly from the right way. * * *
The Church holds to the definite authority of divine revelation which must be the standard; and that, so-called "Science" has changed form age to age in its deductions, and as divine revelation is truth, and must abide forever, views as to the lesser should conform to the positive statements of the greater, and, further, that in institutions funded by the Church for the teaching of theology, as well as other branches of education, its instructors must be in harmony in their teachings with its principles and doctrines. * * *
There are so many demonstrated, practical, material truths, so many spiritual certainties, with which the youth of Zion should become familiar, that it appears a wasted of time and means, and detrimental to faith and religion to enter too extensively into the undemonstrated theories of men on philosophies relating to the origin of life, or the methods adopted by an Allwise Creator in peopling the earth with the bodies of men, birds and beasts. Let us rather turn our abilities to the practical analysis of the soil, the study of the elements, the productions of the earth, the invention of useful machinery, the social welfare of the race, and its material amelioration; and for the rest cultivate and abiding faith in the revealed word of God and the saving principles of the gospel of Jesus Christ, which give joy in this world and in the world to come eternal life and salvation.
Philosophic theories of life have their place and use, not it is not in the classes of the Church schools, and particularly are they out of place here or anywhere else, when they seek to supplant the revelations of God. The ordinary student cannot delve into these subjects deep enough to make them of any practical use to him, and a smattering of knowledge in this line only tends to upset his simple faith in the gospel, which is of more value to him in life than all the learning of the world without it.
The religion of the Latter-day Saints is not hostile to any truth, nor to scientific search for truth. "That which is demonstrated, we accept with joy," said the First Presidency in their Christmas greeting to the Saints, "but vain philosophy, human theory and mere speculations of men we do not accept, nor do we adopt anything contrary to divine revelations or to good common sense, but everything that tends to right conduct, that harmonizes with sound morality and increases faith in Deity, finds favor with us, no matter where it may be found."
A good motto for young people to adopt, who are determined to delve into philosophic theories, is to search all things, but be careful to hold on only to that which is true. The truth persists, but the theories of philosophers change and are overthrown. What men use today as a scaffolding for scientific purposes from which to reach out into the unknown for truth maybe be torn down tomorrow, having served its purpose; but faith is an eternal principle through which the humble believer may secure everlasting solace. It is the only way to find God. (Joseph F. Smith – Improvement Era, Vol. 14, p. 548)
Secret Societies. (pg. 110-111)
It is a well known truth that the counsel of the First Presidency of the Church, in all cases, has been and is against our brethren joining secret organizations for any purpose whatsoever, and that wherever any of them have already joined, they have been and are counseled to withdraw themselves from such organizations, as soon as circumstances permit and wisdom dictates. In taking this position, there has not been, neither is it intended that there shall be, any controversy with the societies, and with their aims and objects. The merits of the various orders are not considered at all; their aims may be ever so worthy and their objects ever so commendable. that matter does not enter into the discussion, so far as a member of our Church is concerned.
The gospel of Jesus Christ is true, and is a power unto salvation, temporal and spiritual. A man who complies in ever respect therewith has everything that any society can offer, with countless truths and consolations added: "But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you." The Church is divinely organized, and in that organization there is provision for the development and practice of every virtue known, ever charity revealed. For this reason and for its promise of eternal life and glory, the gospel, and the Church divinely established for its promulgation, should be nearer and dearer to a follower of Christ than all other things. "No man can serve two masters; for either he will hate the one, and love the other; or else he will hold to the one and despise the other. Ye can not serve God and Mammon."
The members of our church who have faith to heed the advice of the authorities thereof, will not ally themselves, under any pretense with any organization not instituted by the Lord for the building up of Zion. Neither will they, for any consideration, allow themselves to imbibe the spirit of the world, or be tempted to lose their faith, which will be the result with those who divide their interests, devoting some to other organizations. This is the testimony of those who have joined and who have later withdrawn. Nothing can be permitted in the members that is calculated to bring division and weakness to the Church, yet those who have been led to join other institutions should not dealt with harshly, but should be made to understand the position of the Church, and where it is so understood, they should shape their affairs for withdrawal, in humility and repentance, from that which threatens their standing. (Joseph F. Smith - Improvement Era, Vol. 6, p. 305, February, 1903)