The Book of the science of Mechanics must precede the Book of useful inventions.
Every action needs to be prompted by a motive. To know and to will are two operations of the human mind. Discerning, judging, deliberating are acts of the human mind.
Our life is made by the death of others.
Nothing is so much to be feared as Evil Report.
The painter has the Universe in his mind and hands.
It is useful to constantly observe, note, and consider.