Learn to laugh. Seriousness is a sin, and it is a disease. Laughter has tremendous beauty, a lightness. It will bring lightness to you, and it will give you wings to fly. And life is so full of opportunities. You just need the sensitivity. And create chances for other people to laugh. Laughter should be one of the most valued, cherished qualities of human beings - because only man can laugh, no animals are capable of it. Because it is human, it must be of the highest order. To repress it is to destroy a human quality.