"The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently." Friedrich Nietzsche
Nietzsche was my introduction to philosophy and is still my go to guy, his works form the basis for my ideas and inspirations for my literary efforts.
"The Sage as an astronomer: If you still see the stars as something above you, you lack the eye of knowledge." This is one of my favorite quotations of him. We create or own limits.