Mephistopheles

“The physician and the philosopher have different ways of defining the diseases of the soul. For instance anger for the philosopher is a sentiment born of the desire to return an offense, whereas for the physician it is a surging of blood around the heart.”
― Aristotle, De Anima

“Always be ready to speak your mind and a base man will avoid you.”
― William Blake, The Marriage of Heaven and Hell

“Without Contraries is no Progression.”
― William Blake, The Marriage of Heaven and Hell

“For such is the nature of man, that howsoever they may acknowledge many others to be more witty, or more eloquent, or more learned; Yet they will hardly believe there be many so wise as themselves: For they see their own wit at hand, and other mens at a distance.”
― Thomas Hobbes, Leviathan