An argument fatal to the communist theory, is suggested by the fact, that a desire for property is one of the elements of our nature.
Herbert Spencer

Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe?
Stephen Hawking

If we do discover a complete theory, it should be in time understandable in broad principle by everyone. Then we shall all, philosophers, scientists, and just ordinary people be able to take part in the discussion of why we and the universe exist.
Stephen Hawking

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?
Erma Bombeck

Experience without theory is blind, but theory without experience is mere intellectual play.
Immanuel Kant

The world runs on individuals pursuing their self interests. The great achievements of civilization have not come from government bureaus. Einstein didn't construct his theory under order from a, from a bureaucrat. Henry Ford didn't revolutionize the automobile industry that way.
Milton Friedman

The theory seems to be that as long as a man is a failure he is one of God's children, but that as soon as he succeeds he is taken over by the Devil.
H. L. Mencken

Morality is the theory that every human act must be either right or wrong, and that 99 % of them are wrong.
H. L. Mencken

A professor must have a theory as a dog must have fleas.
H. L. Mencken

The whole theory of the universe is directed unerringly to one single individual.
Walt Whitman

He had a theory, Walt did, that the religious life, and all the agony that goes with it, is just something God sics on people who have the gall to accuse Him of having created an ugly world.
J. D. Salinger

What we should be teaching are the problems and holes and I think there are legitimate problems and holes in the theory of evolution. And what we need to do is to present those fairly from a scientific point of view. And we should lay out areas in which the evidence supports evolution and the areas in the evidence that does not.
Rick Santorum

Land: A part of the earth's surface, considered as property. The theory that land is property subject to private ownership and control is the foundation of modern society, and is eminently worthy of the superstructure.
Ambrose Bierce

Without revolutionary theory there can be no revolutionary movement.
Vladimir Lenin

Without a revolutionary theory there cannot be a revolutionary movement.
Vladimir Lenin

In theory there is a possibility of perfect happiness: To believe in the indestructible element within one, and not to strive towards it.
Franz Kafka

A universe with a God would look quite different from a universe without one. A physics, a biology where there is a God is bound to look different. So the most basic claims of religion are scientific. Religion is a scientific theory.
Richard Dawkins

The theory of evolution by cumulative natural selection is the only theory we know of that is in principle capable of explaining the existence of organized complexity.
Richard Dawkins

Today the theory of evolution is about as much open to doubt as the theory that the earth goes round the sun.
Richard Dawkins

Let your religion be less of a theory and more of a love affair.
Gilbert K. Chesterton