Those who know nothing of foreign languages know nothing of their own.

Knowing is not enough; we must apply. Willing is not enough; we must do.

Were the eye not of the sun, How could we behold the light? If God's might and ours were not as one, How could His work enchant our sight?

If you have a great work in your head, nothing else thrives near it; all other thoughts are repelled, and the pleasure of life itself is for the time lost.

Mathematics has the completely false reputation of yielding infallible conclusions. Its infallibility is nothing but identity. Two times two is not four, but it is just two times two, and that is what we call four for short. But four is nothing new at all. And thus it goes on and on in its conclusions, except that in the higher formulas the identity fades out of sight.

One glance, one word from you gives more pleasure than all the wisdom of this world.

The summit charms us, the steps to it do not; with the heights before our eyes, we like to linger in the plain. It is only a part of art that can be taught; but the artist needs the whole. He who is only half instructed speaks much and is always wrong; who knows it wholly is content with acting and speaks seldom or late.