If you put on more clothes as the cold increases, it will have no power to hurt you. Let us hope that.

The supreme misfortune is when theory outstrips performance

The motive power is the cause of all life.

Constancy does not begin, but is that which perseveres.

Fix your course on a star and you'll navigate any storm.

Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.

A man was desired to rise from bed because the sun was already up. He replied: "If I had as far to go and as much to do as he has, I should be up by now; but having but a little way to go, I shall not get up yet."