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 (1844-1900) German philosopher and poet

The Dawn (1881)

Alternate translation:

The surest way of ruining a youth is to teach him to respect those who think as he does more highly than those who think differently from him.
[tr. Hollingdale (1982)]