In the absence of evidence, superstition. It's a Middle Ages thing. That's my theory anyway.
The whole action of the laws tended to increase the number of consumers of food and to diminish the number of producers, was due the invention of the Malthusian theory of population.
Architecture theory is very interesting.
Religion is essentially the art and the theory of the remaking of man. Man is not a finished creation.
Of thousands of others, nearer the centre of the explosion, there was no trace. They vanished. The theory in Hiroshima is that the atomic heat was so great that they burned instantly to ashes - except that there were no ashes.
What remains constant for me, during the last 15 years, has been the conviction that the cold war was a calamity for the entire world, and that it can be justified by no consideration of theory, nor by any supposed national interest.
I'm very manipulative towards directors. My theory is that everyone on the set is directing the film, we're all receiving art messages from the universe on how we should do the film.
My theory is this; I'm not a political songwriter. I'm an honest songwriter.
At MIT, I had the good fortune for seven years to teach network theory, which is basic to many disciplines, to one-third of the undergraduate student body. It was an experiment to see how high we could bring their level of understanding, and it exceeded all of my expectations.
Probability is expectation founded upon partial knowledge. A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty, and leave nether room nor demand for a theory of probabilities.
In order to govern, the question is not to follow out a more or less valid theory but to build with whatever materials are at hand. The inevitable must be accepted and turned to advantage.
My theory on housework is, if the item doesn't multiply, smell, catch fire, or block the refrigerator door, let it be. No one else cares. Why should you?
I have a theory about the human mind. A brain is a lot like a computer. It will only take so many facts, and then it will go on overload and blow up.
We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.
Your theory is crazy, but it's not crazy enough to be true.