The next point to these will be to take care that we do not labour for what is vain, or labour in vain: that is to say, neither to desire what we are not able to obtain, nor yet, having obtained our desire too late, and after much toil to discover the folly of our wishes: in other words, that our labour may not be without result, and that the result may not be unworthy of our labour: for as a rule sadness arises from one of these two things, either from want of success or from being ashamed of having succeeded. We must limit the running to and fro which most men practise, rambling about houses, theatres, and marketplaces. They mind other men's business, and always seem as though they themselves had something to do. If you ask one of them as he comes out of his own door, "Whither are you going?" he will answer, "By Hercules, I do not know: but I shall see some people and do something." They wander purposelessly seeking for something to do, and do, not what they have made up their minds to do, but what has casually fallen in their way. They move uselessly and without any plan, just like ants crawling over bushes, which creep up to the top and then down to the bottom again without gaining anything. Many men spend their lives in exactly the same fashion, which one may call a state of restless indolence. You would pity some of them when you see them running as if their house was on fire: they actually jostle all whom they meet, and hurry along themselves and others with them, though all the while they are going to salute someone who will not return their greeting, or to attend the funeral of someone whom they did not know: they are going to hear the verdict on one who often goes to law, or to see the wedding of one who often gets married: they will follow a man's litter, and in some places will even carry it: afterwards returning home weary with idleness, they swear that they themselves do not know why they went out, or where they have been, and on the following day they will wander through the same round again. Let all your work, therefore, have some purpose, and keep some object in view: these restless people are not made restless by labour, but are driven out of their minds by mistaken ideas: for even they do not put themselves in motion without any hope: they are excited by the outward appearance of something, and their crazy mind cannot see its futility. In the same way every one of those who walk out to swell the crowd in the streets, is led round the city by worthless and empty reasons; the dawn drives him forth, although he has nothing to do, and after he has pushed his way into many men's doors, and saluted their nomenclators one after the other, and been turned away from many others, he finds that the most difficult person of all to find at home is himself. From this evil habit comes that worst of all vices, tale-bearing and prying into public and private secrets, and the knowledge of many things which it is neither safe to tell nor safe to listen to.