I mean the word proof not in the sense of the lawyers, who set two half proofs equal to a whole one, but in the sense of a mathematician, where half proof = 0, and it is demanded for proof that every doubt becomes impossible.
Carl Friedrich Gauss

In this world of doubt, one thing is certain for me; that I will go on writing songs up to and - I hope, through heavenly means or diabolical - beyond the day I die.
Robyn Hitchcock

You have a class of investors and you have a class of speculators. The speculators historically haven't been big enough to cause the investors to doubt the long-term vision of stock.
Jim Cramer

However, without considering this connection, there is no doubt but that more good than evil, more delight than sorrow, arises from compassion itself; there being so many things which balance the sorrow of it.
Joseph Butler

In these times, the hardest task for social or political activists is to find a way to get people to wonder again about what we all believe is true. The challenge is to sow doubt.
Lawrence Lessig

But my doubt would not be overcome. Kierkegaard had declared that it was only to the consciousness of sin that Christianity was not horror or madness. For me it was sometimes both.
Georg Brandes

There is no doubt: the study of man is just beginning, at the same time that his end is in sight.
Elias Canetti

If I read not amiss, this powerful race will move down upon Mexico, down upon Central and South America, out upon the islands of the sea, over upon Africa and beyond. And can any one doubt that the results of this competition of races will be the "survival of the fittest?"
Josiah Strong

I don't have any doubts either about the Universal Declaration of Human Rights. Perhaps some more should be added to the list, but I don't have the slightest doubt about human rights.
Antonio Tabucchi

With respect to the respective French and German traditions you are no doubt correct, although I am reluctant to see individual achievement reduced to archetypes.
Brian Ferneyhough

It has since been agreed that speeches given in English will be translated into French and vice versa, and even into German and Italian when necessary. No doubt translations into Esperanto will also soon be in demand.
Fredrik Bajer

When you make work, your goal might not be first and foremost to have as many people as possible see it, but it might be more about honing your craft as a storyteller or making art, but, there's no doubt about it, you want lots of people to see it.
Jim McKay

When in doubt, exchange.
John Zimmerman

He who has conquered doubt and fear has conquered failure.
James Lane Allen

Gold and silver are no doubt subject to fluctuations, from the discovery of new and more abundant mines; but such discoveries are rare, and their effects, though powerful, are limited to periods of comparatively short duration.
David Ricardo

There can, therefore, be no doubt that Presbyterians do carry out the principle that Church power vests in the Church itself, and that the people have a right to a substantive part in its discipline and government.
Charles Hodge

Who can doubt that between the English and the French, between the Scotch and the Irish, there are differences of character which have profoundly affected and still affect the course of history?
Goldwin Smith

The short English miles are delightful for walking. You are always pleased to find, every now and then, in how short a time you have walked a mile, though, no doubt, a mile is everywhere a mile, I walk but a moderate pace, and can accomplish four English miles in an hour.
Karl Philipp Moritz

If there are Muslims who believe that they've got to kill Christians to make a way for the Islamic faith in the West, not only would they be disappointed, but it will lead to conflict, there's no doubt about that.
George Carey

One has to accept pain as a condition of existence. One has to court doubt and darkness as the cost of knowing. One needs a will stubborn in conflict, but apt always to the total acceptance of every consequence of living and dying.
Morris West