Yet nothing delights the mind so much as faithful and pleasant friendship: what a blessing it is when there is one whose breast is ready to receive all your secrets with safety, whose knowledge of your actions you fear less than your own conscience, whose conversation removes your anxieties, whose advice assists your plans, whose cheerfulness dispels your gloom, whose very sight delights you! We should choose for our friends men who are, as far as possible, free from strong desires: for vices are contagious, and pass from a man to his neighbour, and injure those who touch them. As, therefore, in times of pestilence we have to be careful not to sit near people who are infected and in whom the disease is raging, because by so doing, we shall run into danger and catch the plague from their very breath; so, too, in choosing our friends’ dispositions, we must take care to select those who are as far as may be unspotted by the world; for the way to breed disease is to mix what is sound with what is rotten. Yet I do not advise you to follow after or draw to yourself no one except a wise man: for where will you find him whom for so many centuries we have sought in vain? in the place of the best possible man take him who is least bad.