Even the richest soil, if left uncultivated will produce the rankest weeds.

True and great love springs out of great knowledge, and where you know little you can love but little or not at all.

You should prefer a good scientist without literary abilities than a literate one without scientific skills

He who does not understand the supreme certainty of mathematics is wallowing in confusion.

He who walks straight rarely falls.

In fact, whatever exists in the universe, in essence, in appearance, in the imagination, the painter has first in his mind and then in his hands ... it lies in his power to create them . . .

Your brain is much better than you think; just use it!