If you throw a stone in a pond... the waves which strike against the shores are thrown back towards the spot where the stone struck; and on meeting other waves they never intercept each other's course... In a small pond one and the same stroke gives birth to many motions of advance and recoil.

Being engulfed in practice without delicate knowledge related to it, is in many ways like entering a ship without knowing where it is headed.

When you are painting you should take a flat mirror and often look at your work within it, and it will then be seen in reverse, and will appear to be by the hand of some other master, and you will be better able to judge of its faults than in any other way.

For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.

Thou, O God, dost sell us all good things at the price of labor.

Darkness is absence of light. Shadow is diminution of light.

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