Those who are inspired by a model other than Nature, labor in vain.

Our life is made by the death of others.

Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.

If you find from your own experience that something is a fact and it contradicts what some authority has written down, 25 then you must abandon the authority and base your reasoning on your own findings.

Poor is the pupil who does not surpass his master.

Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.

If you are on the side whence the wind is blowing you will see the trees looking much lighter than you would see them on the other sides; and this is due to the fact that the wind turns up the reverse side of the leaves which in all trees is much whiter than the upper side.

If you are representing a white body let it be surrounded by ample space, because as white has no color of its own, it is tinged and altered in some degree by the color of the objects surrounding it.

Inequality is the cause of all local movements.

The sun gives spirit and life to the plants and the earth nourishes them with moisture.