I wouldn't say testimonies are about what you KNOW. they are about what you BELIEVE. Saying "I KNOW the church is true" while it sounds nice is, I feel, incorrect. You don't KNOW and that is why you need faith. Religion isn't about knowing but about faith and believing. How can you really say that you KNOW the church is true? You believe it, sure. You feel happy about it or whatever but "know?" I don't think so. This brings to mind that good old Alma scripture. Let's see...
21 And now as I said concerning faith--faith is not to have a perfect knowledge of things; therefore if ye have faith ye hope for things which are not seen, which are true.
26 Now, as I said concerning fait--that it was not a perfect knowledge--even so it is with my words. Ye cannot know of their surety at first, unto perfection, any more than faith is a perfect knowledge.
Alma 32 talks about experimenting upon the word and testing to know if the seed is "good." Have you tested your seed?
32 Therefore, if a seed groweth it is good, but if it groweth not, behold it is not good, therefore it is cast away.
Alma 32 suggests that you plant the seed and nourish it. if it is "good" it will grow.
33 And now, behold, because ye have tried the experiment, and planted the seed, and it swelleth and sprouteth, and beginneth to grow, ye must needs know that the seed is good.
The experiment seems to be planting the seed, believing already that the seed is true. but until the seed grows you can't know. you can wait your entire life for that seed to sprout. If it never does then why? did you not have enough faith in it? was it a bad seed? Has your seed sprouted or are you still waiting for it to grow?
My seed didn't grow. I waited and looked and thought sometimes I might have seen something there but found they were only weeds pretending to be a testimony. When I truly "tested" the seed I found it to be a bad seed. You can't just wait for it to grow forever and ever. you have to find out. study the seed. If you cut open the seed and look inside you will see what it is really made of. Unfortunately, once the seed is cut open you risk finding your answer inside and you can't plant that seed again. it's open with all of it's doubt and dirt exposed. you may find it is a fruit you wouldn't want to have growing in your yard, even if it were to grow. For me that's what I found. I got sick of waiting and growing only weeds and I opened my seed and found I didn't want that "fruit." In fact, there was nothing there that would grow anything more than ignorance for me.