Letters 38.1

You are right when you urge that we increase our mutual traffic in letters. But the greatest benefit is to be derived from conversation, because it creeps by degrees into the soul. Lectures prepared beforehand and spouted in the presence of a throng have in them more noise but less intimacy. Philosophy is good advice; and no one can give advice at the top of his lungs. Of course we must sometimes also make use of these harangues, if I may so call them, when a doubting member needs to be spurred on; but when the aim is to make a man learn, and not merely to make him wish to learn, we must have recourse to the low-toned words of conversation. They enter more easily, and stick in the memory; for we do not need many words, but, rather, effective words.

Seneca, Letters to Lucilius 38.1, translated by Richard Mott Gummere