It was not simply out of a spirit of contradiction that I exposed a light source to magnetic forces. The idea came to me during an investigation of the effect discovered by Kerr on light reflected by magnetic mirrors.

In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory.

When a contradiction is impossible to resolve except by a lie, then we know that it is really a door.

There is, I conceive, no contradiction in believing that mind is at once the cause of matter and of the development of individualised human minds through the agency of matter.

The cardinal responsibility of leadership is to identify the dominant contradiction at each point of the historical process and to work out a central line to resolve it.

The exercise of authority over the same area by two States is a contradiction.

What the nation's built on is discussion, contradiction and growth, and at the moment you can't discuss anything. If you do start to discuss it, you get criticized. If people hate us, you have to find out why and try to solve that problem.

The world is a perpetual caricature of itself; at every moment it is the mockery and the contradiction of what it is pretending to be.

Hope, insofar as it is hope of resurrection, is the living contradiction of what it proceeds from and what is placed under the sign of the Cross and death.

The language of the moment or, as it were, the language of the order in which we live, is the image. I felt that if I wanted to commune with the public, I should best do so through the language of image. It's a conscious embrace of a contradiction.

Contradictions do not exist. Whenever you think you are facing a contradiction, check your premises. You will find that one of them is wrong.

Woman's at best a contradiction still.

That was my first lesson from Ben-Gurion. Then I saw him making peace, and I saw him making war. He mobilized me before the war. The man was a very rare combination between a real intellectual and a born leader. There is a contradiction between the two.

I am absolutely opposed to a national ID card. This is a total contradiction of what a free society is all about. The purpose of government is to protect the secrecy and the privacy of all individuals, not the secrecy of government. We don't need a national ID card.

Contradiction is not a sign of falsity, nor the lack of contradiction a sign of truth.