"And yet this dianoetic quarry, as it is brought in especially by the mathematicians, must first be handed over to the dialecticians for proper use (Euthydemus 290 C; Republic 531 C-534 E). Only dialectic can open up the realm of true being, can give ground for the powers of the ' and can reveal Being and the One and the Good as they are—beyond all time and all opposition—in themselves and in truth."