Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
Leonardo da VinciThe lie is so vile, that even if it were in speaking well of godly things, it would take off something from God's grace; and Truth is so excellent, that if it praises but small things they become noble.
Leonardo da VinciIf you are representing a white body let it be surrounded by ample space, because as white has no colour of its own, it is tinged and altered in some degree by the colour of the objects surrounding it
Leonardo da Vinci