Variant: you can measure the size of a person by what makes him or her angry
Source: How to Win Friends and Influence People
“Real compassion lies within our ability to remember that an angry, vengeful or hateful person is usually just someone who can no longer bear the weary weight of his or her own carefully concealed despair.”
The Secret Way of Wonder
Help us to complete the source, original and additional information
Guy Finley 23
American self-help writer, philosopher, and spiritual teach… 1949Related quotes

Original: Prima di mancare di rispetto ad una persona corretta, pensaci bene. Una persona corretta, tale gesto lo ricorda per tutta la vita.
Source: prevale.net

The Philistine magazine, August 1901 http://books.google.com/books?id=xxI8AQAAMAAJ&q=%22There+is+something+that+is+much+more+scarce+something+finer+far+something+rarer+than+ability+It+is+the+ability+to+recognize+ability+The+sternest+comment+that+can+be+made+against+employers+as+a+class+lies+in+the+fact+that+men+of+Ability+usually+succeed+in+showing+their+worth+in+spite+of+their+employer+and+not+with+his+assistance+and+encouragement%22&pg=PA87#v=onepage
"The Crying Need", in A Message to Garcia, and Thirteen Other Things (1901), p. 163 http://books.google.com/books?id=iSo3AAAAIAAJ&q=%22There+is+something+that+is+much+more+scarce+something+finer+far+something+rarer+than+ability+It+is+the+ability+to+recognize+ability+The+sternest+comment+that+can+be+made+against+employers+as+a+class+lies+in+the+fact+that+men+of+Ability+usually+succeed+in+showing+their+worth+in+spite+of+their+employer+and+not+with+his+assistance+and+encouragement%22&pg=PA163#v=onepage

Country Living and Country Thinking, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“Truth lies within a little and certain compass, but error is immense.”
Reflections upon Exile (1716)

“Now I am weary and I can no longer tell good from Evil, and I need someone to show me the way.”
Orestes to Electra, Act 2
The Flies (1943)

2013, Brandenburg Gate Speech (June 2013)