The Notebooks of Leonardo DaVinci

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

We know very well that errors are better recognised in the works of others than in our own; and that often, while reproving little faults in others, you may ignore great ones in yourself

The sorest misfortune is when your views are in advance of your work.

The water you touch in a river is the last of that which has passed, and the first of that which is coming. Thus it is with time present.

Life if well spent, is long.

The sorest misfortune is when your views are in advance of your work.

In going up stairs, if you place your hands on your knees all the labour taken by the arms is removed from the sinews at the back of the knees.

man when he lies down is reduced to one ninth of his height.

kneeling down a man will lose the fourth part of his height.

The foot, from where it is attached to the leg, to the tip of the great toe is as long as the space between the upper part of the chin and the roots of the hair a b; and equal to five sixths of the face.

space between the extreme poles inside and outside the foot called the ankle or ankle bone a b is equal to the space between the mouth and the inner corner of the eye.