[ttonkytonk]

This reminds me of a passage in Plato's Theaetetus (143e-144b):

Socrates:... So if you have come across anyone worth mentioning, I should be glad to hear.

Theodorus: Well Socrates, I think you ought to be told... about a remarkable boy I have met here... Along with a quickness beyond the capacity of most people, he has an unusually gentle temper...I never thought a combination could exist; I don't see it arising elsewhere. People as acute and keen and retentive as he is are apt to be very unbalanced. They get swept up in a rush, like ships without ballast; what stands for courage in their makeup is a kind of mad excitement; while, on the other hand, the steadier sort of people are apt to come to their studies with minds that are sluggish, somehow - freighted with a bad memory. But this boy approaches his studies in a smooth, sure, effective way, and with great good temper; it reminds one of the quiet flow of a stream of oil.(...)