I would rather suffer and stay awake, and I would rather endure suffering and think, which is better than not thinking. -Zweig

Knowledge is true only when it is acquired by positive thinking, not by memory. -Tolstoy

To make people truly educated, they must possess three qualities: profound knowledge, habit of thinking and noble sentiment. Not much knowledge is ignorance; Not used to thinking is rude or stupid; Without noble sentiments, it is vulgar. -Chernyshevski