A little thought will show you how vastly your own happiness depends on the way other people bear themselves toward you...
Turn the idea around, and remember that just so much you are adding to the pleasure or the misery of other people's days. And this is the half of the matter which you can control. Whether any particular day shall bring to you more of happiness or of suffering is largely beyond your power to determine. Whether each day of your life shall give happiness or suffering rests with yourself.
George S. Merriam