Don't ask what it means, but rather how it is used.

When we think about the future of the world, we always have in mind its being where it would be if it continued to move as we see it moving now. We do not realize that it moves not in a straight line and that its direction changes constantly.

Death is not an event in life: we do not live to experience death.

If there were a verb meaning "to believe falsely," it would not have any significant first person, present indicative.

Proof, one might say, does not merely shew that it is like this, but: how it is like this. It shows how 13+14 yield 27.

Logic is not a body of doctrine, but a mirror-image of the world. Logic is transcendental.

Whereof one cannot speak, thereof one must be silent.