Leonardo da Vinci — "He who wishes to be rich in a day will be hanged in a year."

"An average human looks without seeing, listens without hearing, touches without feeling, eats without tasting, moves without physical awareness, inhales without awareness of odour or fragrance, and ta…"

"Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking and nothing is superfluous."

"The knowledge of all things is possible."

"Experience does not err. Only your judgments err by expecting from her what is not in her power."

"The noblest pleasure is the joy of understanding."