In many cases one and the same thing is attracted by two strong forces, namely Necessity and Potency. Water falls in rain; the earth absorbs it from … - Leonardo da Vinci

Learning is the only thing the mind never exhausts, never fears, and never regrets.

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

Impetus is a power of the mover applied in a movable thing which causes the movable thing to move after it is separated from its mover.