The art of drawing conclusions from experiments and observations consists in evaluating probabilities and in estimating whether they are sufficiently great or numerous enough to constitute proofs. This kind of calculation is more complicated and more difficult than it is commonly thought to be. . .
The art of leading, in operations large or small, is the art of dealing with humanity, of working diligently on behalf of men, of being sympathetic with them, but equally, of insisting that they make a square facing toward their own problems.
The art of life is to show your hand. There is no diplomacy like candor. You may lose by it now and then, but it will be a loss well gained if you do. Nothing is so boring as having to keep up a deception.
The art of living does not consist in preserving and clinging to a particular mood of happiness, but in allowing happiness to change its form without being disappointed by the change for happiness, like a child, must be allowed to grow up.