The bones of the Dead will be seen to govern the fortunes of him who moves them. - Leonardo da Vinci

Among all the studies of natural causes and reasons Light chiefly delights the beholder; and among the great features of Mathematics the certainty of its demonstrations is what preeminently (tends to) elevate the mind of the investigator. Perspective, therefore, must be preferred to all the discourses and systems of human learning. In this branch [of science] the beam of light is explained on those methods of demonstration which form the glory not so much of Mathematics as of Physics and are graced with the flowers of both.

The abbreviators of works do injury to knowledge and to love.Of what value is he who,in order to abbreviate the parts of those things of which he professes to give complete knowledge,leaves out the greater part of the things of which the whole is composed?Oh human stupidity!You don’t see that you are falling into the same error as one who strips a tree of its adornment of branches full of leaves,intermingled with fragrant flowers or fruit in order to demonstrate that the tree is good for making planks

When I did well, as a boy you used to put me in prison. Now if I do it being grown up, you will do worse to me.