It is better to imitate ancient than modern work.
A clever man without wisdom is like a beautiful flower without fragrance.
To speak well of a base man is much the same as speaking ill of a good man.
Everything proceeds from everything else and everything becomes everything, and everything can be turned into everything else.
First study the science, and then practice the art which is born of that science.
Weight is caused by one element being situated in another; and it moves by the shortest line towards its centre, not by its own choice, not because the centre draws it to itself, but because the other intervening element cannot withstand it.