As for a future life, every man must judge for himself between conflicting vague probabilities.

Results rarely specify their causes unambiguously. If we have no direct evidence of fossils or human chronicles, if we are forced to infer a process only from its modern results, then we are usually stymied or reduced to speculation about probabilities. For many roads lead to almost any Rome.
stephen jay gouldEngland is one of the greatest powers of the world. No event or series of events bearing on the balance of power, or on probabilities of peace or war, can be matters of indifferencetoher, and herrighttohaveand to express opinions onmattersthusbearingonher interests is unquestionable.
Palmerston, HenryJohnTemple, 3rd ViscountI am fully assured, that no general method for the solution of questions in the theory of probabilities can be established which does not explicitly recognize, not only the special numerical bases of the science, but also those universal laws of thought which are the basis of all reasoning, and which, whatever they may be as to their essence, are at least mathematical as to their form.
george booleFate laughs at probabilities.
edward bulwerlyttonThe function just found cannot, it is true, express rigorously the probabilities of the errors: for since the possible errors are in all cases confined within certain limits, the probability of errors exceeding those limits ought always to be zero, while our formula always gives some value. However, this defect, which every analytical function must, from its nature, labor under, is of no importance in practice, because the value of our function decreases so rapidly... that it can safely be considered as vanishing. Besides, the nature of the subject never admits of assigning with absolute rigor the limits of error.
carl friedrich gaussNot smoking enough will cause lung cancer! If anybody is getting a cancerous activity in the lung, the probabilities are that it's radiation dosage coupled with the fact that he smokes. And what it does is start to run out the radiation dosage, don't you see.
l. ron hubbardPrevious to the time of Pascal, who would have thought of measuring doubt and belief? Who could have conceived that the investigation of petty games of chance would have led to the most sublime branch of mathematical science  the theory of probabilities?
william stanley jevonsThe best practical advice then is: try to maximize your expected payoff, which is the sum of all payoffs multiplied by probabilities.
howard raiffaThe first attempts to consider the behavior of socalled "random neural nets" in a systematic way have led to a series of problems concerned with relations between the "structure" and the "function" of such nets. The "structure" of a random net is not a clearly defined topological manifold such as could be used to describe a circuit with explicitly given connections. In a random neural net, one does not speak of "this" neuron synapsing on "that" one, but rather in terms of tendencies and probabilities associated with points or regions in the net.
Anatol RapoportWhat underlies our assignment of probabilities in the real world?
simon blackburnIf there is a sectarian war in Iraq today, or perhaps several sectarian wars, we have to understand that this was latent in the country, and in the state, and in the society all along. It was not the only possible outcome, because it had to be willed and organized, but it was certainly high on the list of probabilities.
christopher hitchensMost, probably, of our decisions to do something positive, the full consequences of which will be drawn out over many days to come, can only be taken as the result of animal spirits a spontaneous urge to action rather than inaction, and not as the outcome of a weighted average of quantitative benefits multiplied by quantitative probabilities.
john maynard keynesI'm a pessimist about probabilities, I'm an optimist about possibilities.
Lewis MumfordThe casino is the only human venture I know where the probabilities are known, Gaussian (i.e., bellcurve), and almost computable.
nassim nicholas talebFollowing Korzybski , I put things in probabilities, not absolutes ... My only originality lies in applying this zetetic attitude outside the hardest of the hard sciences, physics , to softer sciences and then to nonsciences like politics , ideology , jury verdicts and, of course, conspiracy theory .
robert anton wilsonHave I ever remarked on how completely ridiculous it is to ask high school students to decide what they want to do with the rest of their lives and give them nearly no support in doing so? Support like, say, spending a day apiece watching twenty different jobs and then another week at their top three choices, with salary charts and projections and probabilities of graduating that subject given their test scores? The more so considering this is a central allocation question for the entire economy?
eliezer yudkowskyThe measure of information to be developed here will also be related to freedom of choice; that is, it will be a function of the probabilities of choice associated with the alternative courses of action... The measure developed here is a function of m, the number of alternative potential courses of action.
Presumption means nothing more than, as stated by Lord Mansfield, the weighing of probabilities, and deciding, by the powers of common sense, on which side the truth is.
Ignorance gives one a large range of probabilities.
george eliotIgnorance gives one a large range of probabilities.
george eliotPhilosophy goes no further than probabilities, and in every assertion keeps a doubt in reserve.
james anthony froudeFollowing Korzybski , I put things in probabilities, not absolutes... My only originality lies in applying this zetetic attitude outside the hardest of the hard sciences, physics, to softer sciences and then to nonsciences like politics, ideology, jury verdicts and, of course, conspiracy theory.