Plutarch Quomodo adulator ab amico internoscatur 21

[21] Let us come without more ado to the topic of services and ministrations; for it is in these that the flatterer brings about a great confusion and uncertainty in regard to the difference between himself and the friend, because he appears to be brisk and eager in everything and never to make an excuse. For the character of a friend, like the language of truth, is, as Euripides ¹ puts it, simple, plain, and unaffected, whereas that of the flatterer, in very truth Self-sick, hath need of dextrous remedies, and of a good many too, I venture to affirm, and of an uncommon sort. Take the case of one person meeting another: a friend sometimes, without the exchange of a word, but merely by a glance and a smile, gives and receives through the medium of the eyes an intimation of the goodwill and intimacy that is in the heart, and passes on. But the flatterer runs, pursues, extends his greeting at a distance, and if he be seen and spoken to first, he pleads his defence with witnesses and oaths over and over again. It is the same with actions: friends omit many of the trifling formalities, not being at all exacting or officious in this respect, not putting themselves forward for every kind of ministration; whereas the flatterer is in these matters persistent, assiduous, and untiring, giving to no one else place or space for a good office, but he is eager for orders, and if he receives none he is nettled, or rather he is utterly dispirited and gives way to lamentations.