America must not ignore the threat gathering against us. Facing clear evidence of peril, we cannot wait for the final proof, the smoking gun that could come in the form of a mushroom cloud.
The best proof of love is trust.
I never believed that Nixon could fully resurrect himself. And the proof of that was in the obits.
The burden of proof is now on the Palestinians... They must fight terrorism and dismantle its infrastructures in order to make possible progress on the roadmap.
The great proof of madness is the disproportion of one's designs to one's means.
Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.
A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.
It is characteristic of science that the full explanations are often seized in their essence by the percipient scientist long in advance of any possible proof.
I am very abnormal... But it wasn't very long ago that I wasn't so abnormal. I was very normal and headed for a lifetime of paying medical bills as proof of my normalcy.
Euclid taught me that without assumptions there is no proof. Therefore, in any argument, examine the assumptions.
In the final analysis, terror is also another proof of the fact that the superpower is not really a superpower. It was vulnerable.
Loneliness is proof that your innate search for connection is intact.
The insatiable thirst for everything which lies beyond, and which life reveals, is the most living proof of our immortality.
Take our own company as an example: We're living proof, we jump with our own parachutes.
The highest proof of virtue is to possess boundless power without abusing it.