Personally, I do not believe the human mind has any limits but those we impose ourselves.

"Actually, all education is self-education. A teacher is only a guide, to point out the way, and no school, no matter how excellent, can give you education. What you receive is like the outlines in a child’s coloring book. You must fill in the colors yourself."

Louis L'Amour

"No one can get an education, for of necessity education is a continuing process."

Louis L'Amour