Oh happy he who still can hope in our day to breathe the truth while plunged in seas of error! What we don't know is really what we need, and what we know is of no use to us whatever!

That which thy fathers have bequeathed to thee, earn it anew if thou wouldst possess it.

From desire I plunge to its fulfilment, where I long once more for desire.

If it is the greatest truth that you seek, the plants can direct you.

If you treat men the way they are you never improve them. If you treat them the way you want them to be, you do.

Experiments are mediators between nature and idea.

A useless life is an early death.