This is really a very important reason to do drugs in the first place, especially psychedelics. They show you how much of your reality/perception is based on a

This is really a very important reason to do drugs in the first place, especially psychedelics. They show you how much of your reality/perception is based on a temporary chemical/biological state, not what you previously thought of as 'reality.' It also teaches you to 'ride it out' in the event of a bad trip (also a valuable experience). Ironically to some, doing drugs like this can make you more sane.