538  We are in the habit of exaggerating or imagining or anticipating sorrow. We are torn by things present or about things yet to come. Consider whether your proofs of future troubles are sure. For it is more often the case that we are troubled by our apprehensions.
2497  “A thousand words will not leave so deep an impression as one deed.”
1709  “Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
459  I am sure the grapes are sour.
581  Your most unhappy customers are your greatest source of learning