Who sows virtue ought to reap honour.

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

The noblest pleasure is the joy of understanding.

Experience does not err. Only your judgments err by expecting from her what is not in her power.

Of several bodies, all equally large and equally distant, that which is most brightly illuminated will appear to the eye nearest and largest.

There shall be wings! If the accomplishment be not for me, 'tis for some other. The spirit cannot die; and man, who shall know all and shall have wings.

He who fears dangers will not perish by them.