Plutarch, De garrulitate
Goodwin, Ed.

He then, that by often repeating and reflection shall [p. 245] enure himself to such precedents as these, may in time perhaps be more delighted with these short and conclusive apophthegms than with the exorbitances of loose and lavish discourse. For my own part, I must acknowledge that I am not a little ashamed of myself, when I call to mind that same domestic servant of whom I am now going to speak, and consider how great a thing it is to advise before a man speaks, and then to be able to maintain and stick to what he has resolved upon.

Pupius Piso, the rhetorician, being unwilling to be disturbed with much talk, gave orders to his servants to answer to such questions only as he should ask them, and say no more. Then having a design to give an entertainment to Clodius, at that time magistrate, he ordered him to be invited, and provided a splendid banquet for him, as in all probability he could do no less. At the time appointed several other guests appeared, only they waited for Clodius's coming, who tarried much longer than was expected; so that Piso sent his servant several times to him, to know whether he would be pleased to come to supper or no. Now when it grew late and Piso despaired of his coming, What! said he to his servant, did you call him? Yes, replied the servant. Why then does he not come away? Because he told me he would not come. Why did you not tell me so before? Because, sir, you never asked me the question. This was a Roman servant. But an Athenian servant, while he is digging and delving, will give his master an account of the articles and capitulations in a treaty of peace. So strangely does custom prevail in all things, of which let us now discourse.