This seems to be recognized in constitutions too: no honour is paid to him who contributes nothing to the common stock of good; the common stock is distributed among those who benefit the community, and of this common stock honour is a part. For he who makes money out of the community must not expect to be honoured by the community also; and no one is content to receive a smaller share in everything. To him, then, who spends money on public objects we pay due honour, and money to him whose services can be paid in money; for, by giving to each what is in proportion to his merit, equality is effected and friendship preserved, as we said before.
The same principles, then, must regulate the intercourse of individuals who are unequal; and he who is benefited by another in his purse or in his character, must give honour in return, making repayment in that which he can command. For friendship exacts what is possible rather than what is due: what is due is sometimes impossible, as, for instance, in the case of the honour due to the gods and to parents; for no one could ever pay all his debt to them; but he who gives them such service as he can command is held to fulfil his obligation.