The poet ranks far below the painter in the representation of visible things, and far below the musician in that of invisible things.

Experience does not ever err. It is only your judgment that errs in promising itself results which are not caused by your experiments.

Those who become enamored of practices without science are like sailors who go aboard ship without a rudder and compass, for they are never certain where they will land.

When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.

Study without desire spoils the memory, and it retains nothing that it takes in.

Blinding ignorance does mislead us.
O! Wretched mortals, open your eyes!

Iron rusts from disuse; water loses its purity from stagnation and in cold weather becomes frozen; even so does inaction sap the vigors of the mind.

Whoever in discussion adduces authority uses not intellect but memory.

It is easier to resist at the beginning than at the end.

Patience serves as a protection against wrongs as clothes do against cold. For if you put on more clothes as the cold increases, it will have no power to hurt you. So in like manner you must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.

As a well-spent day brings happy sleep, so a life well used brings a happy death.

Iron rusts from disue; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.