There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination. Denis Diderot
There are three principles in a man's being and life, the principle of thought, the principle of speech, and the principle of action. The origin of all conflict between me and my fellow-men is that I do not say what I mean and I don't do what I say. Martin Buber
There are three rape scenes that I've had to act in, and none of them have gotten to film. I don't think it's something that should be promoted in any way. Joan Severance
There are three reasons for becoming a writer: the first is that you need the money; the second that you have something to say that you think the world should know; the third is that you can't think what to do with the long winter evenings. Quentin Crisp
There are three reasons why this book came into being. First, throughout the 33 years I've been writing recipes - although I'm not vegetarian myself - I have greatly enjoyed creating vegetarian recipes, and cooking and serving them at home. Delia Smith
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians. Georges Pompidou
There are three secrets to managing. The first secret is have patience. The second is be patient. And the third most important secret is patience. Chuck Tanner
There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down. Paul Erdos
There are three subjects on which the knowledge of the medical profession in general is woefully weak; they are manners, morals, and medicine. Gerald F. Lieberman
