Logic is the science not of external forms of thought, but of the laws of development "of all material, natural and spiritual things", i. e., of the development of the entire concrete content of the world and of its cognition, i. e., the sum-total, the conclusion of the History of knowledge of the world.
Vladimir LeninRelated topics
cognition concrete content development entire history knowledge natural science thought things LawsRelated quotes
The most ordinary things are to philosophy a source of insoluble puzzles. With infinite ingenuity it constructs a concept of space or time and then finds it absolutely impossible that there be objects in this space or that processes occur during this time.... the source of this kind of logic lies in excessive confidence in the so-called laws of thought.
Ludwig Boltzmann
The chief requisite for the making of a good chicken pie is chicken; no amount of culinary legerdemain can make up for the lack of chicken. In the same way, the chief requisite for the history of science is intimate scientific knowledge; no amount of philosophic legerdemain can make up for its absence.
George Sarton
I believe that the unity of man as opposed to other living things derives from the fact that man is the conscious life of himself. Man is conscious of himself, of his future, which is death, of his smallness, of his impotence; he is aware of others as others; man is in nature, subject to its laws even if he transcends it with his thought.
Erich Fromm