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 distinguished from all other sciences except only ethics, in standing in no need of ethics. — Charles Sanders Peirce Copy Share Image
...mathematics is distinguished from all other sciences except only ethics, in standing in no need of ethics. Every other science, even logic,… — Charles Sanders Peirce Copy Share Image
The truth is, that common-sense, or thought as it first emerges above the level of the narrowly practical, is deeply imbued with… — Charles Sanders Peirce Copy Share Image
Truly, that reason upon which we plume ourselves, though it may answer for little things, yet for great decisions is hardly surer… — Charles Sanders Peirce Copy Share Image
Mathematics is purely hypothetical: it produces nothing but conditional propositions. — 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
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 Image
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 Image
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 Image
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 Image
... and it is probably that there is some secret here which remains to be discovered. — Charles Sanders Peirce Copy Share Image
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 Image
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 Image
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 Image
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 Image
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 Image
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 Image
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 Image
