The sentence 'snow is white' is true if, and only if, snow is white.

You will not find in semantics any remedy for decayed teeth or illusions of grandeur or class conflict.

It may be unpopular and out-of-date to say-but I do not think that a scientific result which gives us a better understanding of the world and makes it more harmonious in our eyes should be held in lower esteem than, say, an invention which reduces the cost of paving roads, or improves household plumbing.

There can be no doubt that the knowledge of logic is of considerable practical importance for everyone who desires to think and to infer correctly.

Logic is justly considered the basis of all other sciences, even if only for the reason that in every argument we employ concepts taken from the field of logic, and that ever correct inference proceeds in accordance with its laws.