Mind-expanding is a term giving a sense of heightened or broader awareness. It is the mark of a highly knowledgeable and developed mind able to accept actuality as unreality and vice versa, although not excepting ignorance as a state of mind.

"Most people, including ourselves, live in a world of relative ignorance. We are even comfortable with that ignorance, because it is all we know. When we first start facing truth, the process may be frightening, and many people run back to their old lives. But if you continue to seek truth, you will eventually be able to handle it better. In fact, you want more! It's true that many people around you now may think you are weird or even a danger to society, but you don't care. Once you've tasted the truth, you won't ever want to go back to being ignorant!"

Plato (The Republic)