
The pragmatist knows that doubt is an art which hs to be acquired with difficulty. —
Charles Sanders Peirce

To know what we think, to be masters of our own meaning, will make a solid foundation for great and weighty thought. —
Charles Sanders Peirce

Mere imagination would indeed be mere trifling; only no imagination is mere . —
Charles Sanders Peirce

The idea does not belong to the soul; it is the soul that belongs to the idea. —
Charles Sanders Peirce

We do not really think, we are barely conscious, until something goes wrong. —
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

The universe ought to be presumed too vast to have any character. —
Charles Sanders Peirce

Mathematics is purely hypothetical: it produces nothing but conditional propositions. —
Charles Sanders Peirce

All the greatest achievements of mind have been beyond the power of unaided individuals. —
Charles Sanders Peirce

It is not knowing, but the love of learning, that characterizes the scientific man. —
Charles Sanders Peirce

Let us not pretend to doubt in philosophy what we do not doubt in our hearts. —
Charles Sanders Peirce

It is impossible not to envy the man who can dismiss reason, although we know how it must turn out at last. —
Charles Sanders Peirce

It is ... easy to be certain. One has only to be sufficiently vague. —
Charles Sanders Peirce

Truly, that reason upon which we plume ourselves, though it may answer for little things, yet for great decisions is hardly surer than a toss up. —
Charles Sanders Peirce

Unless man have a natural bent in accordance with nature's, he has no chance of understanding nature at all. —
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

And it is probably that there is some secret here which remains to be discovered. —
Charles Sanders Peirce

Every new concept first comes to the mind in a judgment. —
Charles Sanders Peirce