The Fourth Way is based on the gradation found in things. Some things are discovered to be more or less good, or true, or noble, than other things, and so on. But things are said to be more or less F to the extent to which they approach to something which is most F; for example, things are hotter the more they approach what is hottest. There is therefore something which is truest and best and noblest of things, and consequently most in being (maxime ens); for Aristotle says that the truest things are the things most in being. Now whatever is most F is the cause of whatever else is F, just as fire (as Aristotle says in the same book) is the hottest thing and the cause of all other hot things. Therefore there is something which causes being and goodness and any perfection in all things; and this we call 'God'.!