You don't get into trouble because of the things you don't know. It is the things you don't know you don't know that really get you into a mess.
Leonardo da VinciHe who wishes to see how the soul inhabits the body should look to see how that body uses its daily surroundings. If the dwelling is dirty and neglected, the body will be kept by its soul in the same condition, dirty and neglected.
Leonardo da VinciAnyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
Leonardo da Vinci