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To express the same idea in still another way, I think that human knowledge is essentially active.

In so far as such a theory is empirically correct it will also tell us what empirical facts it should be possible to observe in a given set of circumstances.

Knowledge is more important than life. We've only one excuse for existing, to think, to find out, to learn.

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

Scientific knowledge is a kind of discourse.

Knowledge is the life of the mind.

But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.

To have real knowledge, one must understand the essence of things and not only their manifestations.

Knowledge is what we get when an observer, preferably a scientifically trained observer, provides us with a copy of reality that we can all recognize.