"These illustrations suggest four general maxims, which will prove an adequate preventive of persecution mania if their truth is sufficiently realized. The first is: remember that your motives are not always as altruistic as they seem to yourself. The second is: Don't overestimate your own merits. The third is: don't expect others to take as much interest in you as you do yourself. And the fourth is: don't imagine that most people give enough thought to you to have any desire to persecute you."
January 1, 1970
https://en.wikiquote.org/wiki/The_Conquest_of_Happiness