Not everyone gets to experience the most important things such as things of God. So those who experience such things sometimes write them down for the benefit of those who don’t. Also, we might not experience advanced but valuable and necessary experiences until late in life, so it is good for the young to be able to read about such things in their youth, because the old have written what they know. This is how society and civilisation grows better with written records. Writing has downsides. It can be misunderstood. Most importantly, one downside is that people reading the writings tend to think they have done all they need to do to gain essential knowledge just by reading, but fail to go out there and find out for themselves what the writings are telling them to find or do. People read the writings academically, without incorporating their leadings into their lives. The Bible has books like this. You learn what you can from them, but still you need to go get the life and truth which is out there in Christ. It all points to Christ, but its point is that you need to go find him, not just read about him.