We ought to be even more careful to choose a favorable opportunity when we ask for a benefit to be repaid to us than when we ask for one to be bestowed upon us. We must be temperate in our language, so that the grateful may not take offence, or the ungrateful pretend to do so. If we lived among wise men, it would be our duty to wait in silence until our benefits were returned. Yet even to wise men it would be better to give some hint of what our position required. We ask for help even from the gods themselves, from whose knowledge nothing is hid, although our prayers cannot alter their intentions towards us, but can only recall them to their minds. Homer's priest, [Il. i. 39 sqq.] I say, recounts even to the gods his duteous conduct and his pious care of their altars. The second best form of virtue is to be willing and able to take advice.[Hes. Op. 291.] A horse who is docile and prompt to obey can be guided hither and thither by the slightest movement of the reins. Very few men are led by their own reason: those who come next to the best are those who return to the right path in consequence of advice; and these we must not deprive of their guide. When our eyes are covered they still possess sight; but it is the light of day which, when admitted to them, summons them to perform their duty: tools lie idle, unless the workman uses them to take part in his work. Similarly men's minds contain a good feeling, which, however, lies torpid, either through luxury and disuse, or through ignorance of its duties. This we ought to render useful, and not to get into a passion with it, and leave it in its wrong doing, but bear with it patiently, just as schoolmasters bear patiently with the blunders of forgetful scholars; for as by the prompting of a word or two their memory is often recalled to the text of the speech which they have to repeat, so men's goodwill can be brought to return kindness by reminding them of it. BOOK VI. I. There are some things, my most excellent Liberalis, which lie completely outside of our actual life, and which we only inquire into in order to exercise our intellects, while others both give us pleasure while we are discovering them, and are of use when discovered. I will place all these in your hands; you, at your own discretion, may order them either to be investigated thoroughly, or to be reserved, and be used as agreeable interludes. Something will be gained even by those which you dismiss at once, for it is advantageous even to know what subjects are not worth learning. I shall be guided, therefore, by your face: according to its expression, I shall deal with some questions at greater length, and drive others out of court, and put an end to them at once.