Bad reasoning as well as good reasoning is possible; and this fact is the foundation of the practical side of logic. — Charles Sanders Peirce Copy Share Image
Mathematics is purely hypothetical: it produces nothing but conditional propositions. — Charles Sanders Peirce Copy Share Image
Mathematics is distinguished from all other sciences except only ethics, in standing in no need of ethics. — Charles Sanders Peirce Copy Share Image
The method of authority will always govern the mass of mankind; and those who wield the various forms of organized force in… — Charles Sanders Peirce Copy Share Image
Theoretically, I grant you, there is no possibility of error in necessary reasoning. But to speak thus "theoretically," is to uselanguage in… — Charles Sanders Peirce Copy Share Image
It is certain that the only hope of retroductive reasoning ever reaching the truth is that there may be some natural tendency… — Charles Sanders Peirce Copy Share Image
Among the minor, yet striking characteristics of mathematics, may be mentioned the fleshless and skeletal build of its propositions; the peculiar difficulty,… — Charles Sanders Peirce Copy Share Image
Every work of science great enough to be well remembered for a few generations affords some exemplification of the defective state of… — Charles Sanders Peirce Copy Share Image
The real, then, is that which, sooner or later, information and reasoning would finally result in, and which is therefore independent of… — Charles Sanders Peirce Copy Share Image
If we are to define science, ... it does not consist so much in knowing, nor even in "organized knowledge," as it does in… — Charles Sanders Peirce Copy Share
It will sometimes strike a scientific man that the philosophers have been less intent on finding out what the facts are, than on inquiring… — Charles Sanders Peirce Copy Share
One will meet, for example, the virtual assumption that what is relative to thought cannot be real. But why not, exactly? Red is relative… — Charles Sanders Peirce Copy Share
Generality is, indeed, an indispensable ingredient of reality; for mere individual existence or actuality without any regularity whatever is a nullity. Chaos is pure… — Charles Sanders Peirce Copy Share
... and it is probably that there is some secret here which remains to be discovered. — Charles Sanders Peirce Copy Share
Our whole past experience is continually in our consciousness, though most of it sunk to a great depth of dimness. I think of consciousness… — Charles Sanders Peirce Copy Share
Theoretically, I grant you, there is no possibility of error in necessary reasoning. But to speak thus "theoretically," is to uselanguage in a Pickwickian… — Charles Sanders Peirce Copy Share
Looking out of my window this lovely spring morning I see an azalea in full bloom. No, no! I do not see that; though… — Charles Sanders Peirce Copy Share
Fate then is that necessity by which a certain result will surely be brought to pass according to the natural course of events however… — Charles Sanders Peirce Copy Share
If man were immortal he could be perfectly sure of seeing the day when everything in which he had trusted should betray his trust,… — Charles Sanders Peirce Copy Share
Some think to avoid the influence of metaphysical errors, by paying no attention to metaphysics; but experience shows that these men beyond all others… — Charles Sanders Peirce Copy Share
The percept is the reality. It is not in propositional form. But the most immediate judgment concerning it is abstract. It is therefore essentially… — Charles Sanders Peirce Copy Share
There never was a sounder logical maxim of scientific procedure than Ockham's razor: Entia non sunt multiplicanda praeter necessitatem. That is to say; before… — Charles Sanders Peirce Copy Share
And what, then, is belief? It is the demi-cadence which closes a musical phrase in the symphony of our intellectual life. — Charles Sanders Peirce Copy Share
A hypothesis is something which looks as if it might be true and were true, and which is capable of verification or refutation by… — Charles Sanders Peirce Copy Share
