Full Idea
The surest way to ruin a youth is by teaching him to respect those who think like him more highly than those who think differently.
Gist of Idea
Teach youth to respect people who differ with them, not people who agree with them
Source
Friedrich Nietzsche (Dawn (Daybreak) [1881], 297)
Book Reference
Nietzsche,Friedrich: 'Dawn (Daybreak) (v 5)', ed/tr. Smith, Brittain [Stanford 2011], p.187
A Reaction
On the whole I prefer to read the philosophers who seem to be on my side, because I am trying to strengthen my explanation of the world, and opponents aren't much help. I do read opponents, if they explicitly challenge what I defend.