The growth of the mind. The establishment of values. The development of thought process.
This is stunted and twisted in the mind of an insane individual. The roots from which your life grows from are poisoned.
How can you view the world with any certainty when your roots are rotten?
Whatever grows from that pain and confusion tints the color of the world forever. You learn to find what is really important to you. You learn what real feelings are. You become more secure in who you are as a person.
From a diseased mind comes something beautiful.