“If a person offends you, and you are in doubt as to whether it was intentional or not, do not resort to extreme measures; simply watch your chance, and hit him with a brick.”
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Mark Twain 637
American author and humorist 1835–1910Related quotes

“Let me assure you that my intent is not to offend or merely be provocative. I'm simply worried.”

Sam Querrey was in awe after Federer flashed his racquet between his legs to lob him at Wimbledon 2015 https://www.theguardian.com/sport/2015/jul/02/roger-federer-sam-querrey-wimbledon-2015

“Sometimes life hits you in the head with a brick. Don’t lose faith.”
2005-09, Address at Stanford University (2005)
Context: Sometimes life hits you in the head with a brick. Don’t lose faith. I’m convinced that the only thing that kept me going was that I loved what I did. You’ve got to find what you love. And that is as true for your work as it is for your lovers. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all matters of the heart, you'll know when you find it. And, like any great relationship, it just gets better and better as the years roll on. So keep looking. Don’t settle.

Go Rin No Sho (1645), The Water Book
Variant: you can measure the size of a person by what makes him or her angry
Source: How to Win Friends and Influence People

In an interview https://80000hours.org/2014/10/interview-holden-karnofsky-on-the-importance-of-personal-fit/ with Benjamin Todd, January 2014

Quoted in interview with Jack Fincher, "The University Has Become a Factory," Life magazine (1965-02-26).