Charles Sanders Peirce (1839 - 1914) was an American philosopher and physicist.
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
Bad reasoning as well as good reasoning is possible; and this fact is the foundation of the practical side of logic.
Charles Sanders Peirce
Many a man has cherished for years as his hobby some vague shadow of an idea, too meaningless to be positively false.
Charles Sanders Peirce
Every man is fully satisfied that there is such a thing as truth, or he would not ask any question.
Charles Sanders Peirce
To say, therefore, that thought cannot happen in an instant, but requires a time, is but another way of saying that every thought must be interpreted in another, or that all thought is in signs.
Charles Sanders Peirce
Let us not pretend to doubt in philosophy what we do not doubt in our hearts.
Charles Sanders Peirce
Consider what effects that might conceivably have practical bearings you conceive the objects of your conception to have. Then, your conception of those effects is the whole of your conception of the object.
Charles Sanders Peirce
All the evolution we know of proceeds from the vague to the definite.
Charles Sanders Peirce
Mere imagination would indeed be mere trifling; only no imagination is mere.
Charles Sanders Peirce
