Philosophers perennially debate the nature of the good for humans. Is it subjective or objective? That is to say, do the things that are intrinsically good for an agent, good for their own sakes and apart from further consequences, acquire this status only in virtue of how she happens to regard them? Or are there things that are good in themselves for an individual independently of her desires and attitudes toward them? The issue sounds recondite, but has been thought to be pregnant with implications for politics as it ought to be. Plato vigorously insists that knowledge of the good is precious and the person who has it is uniquely fit to rule: "In the world of knowledge, the last thing to be perceived and only with great difficulty is the essential Form of Goodness. Once it is perceived, the conclusion must follow that, for all things, this is the cause of whatever is right and good; in the visible world it gives birth to the light and to the lord of light, while it is itself sovereign in the intelligible world and the parent of wisdom and truth. Without having had a vision of this Form no one can act with wisdom, either in his own life or in matters of state."