Being engulfed in practice without delicate knowledge related to it, is in many ways like entering a ship without knowing where it is headed.
Leonardo da Vinciaverage 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 talks without thinking.
Leonardo da VinciThose who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.
Leonardo da VinciIt had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things.
Leonardo da Vinci