“If you rob someone who would help you if you needed help you only rob yourself. […] Do you imagine you can be cruel without teaching others to be cruel to you?”
Volume 3, Ch. 17
Fiction, The Book of the Short Sun (1999–2001)
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Gene Wolfe 102
American science fiction and fantasy writer 1931–2019Related quotes

As quoted in George Leggett, The Cheka: Lenin’s Political Police (1981), page 57.
Attributions

Love – That’s All Cary Grant Ever Thinks About (1964)
“Mathematics alone will blind you and let others rob you.”
Source: The Poker Face of Wall Street (2006), Chapter 9, Who Got Game, p. 279
Context: Mathematical theory, tested in practice and constantly retested, is a valuable aid to play. Mathematics alone will blind you and let others rob you.

Source: Robert Baden-Powell: Scouting for Boys, The Original

1860s, On The Choice Of Books (1866)

“You cannot teach a man anything, you can only help him to find it within himself.”
As quoted in How to Win Friends and Influence People (1935) by Dale Carnegie, p. 117; also paraphrased as "You cannot teach a man anything, you can only help him to find it for himself." Attributions are found as early as 1882.
Attributed
Source: Google Books link https://books.google.com/books?id=h70_AQAAMAAJ&pg=PA476&dq=You+cannot+teach+a+man+anything;+you+can+only+help+him+find+it+within+himself&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMI39Gmss_gyAIVRNRjCh1Q2wGN#v=onepage&q=%22You%20cannot%20teach%22&f=false

Source: Social Justice, I Will Tear Down My Barns, p. 62
Source: Party Monster: A Fabulous But True Tale of Murder in Clubland