Aphorism #255 Do Good a little at a time, but often.
One should never give beyond the possibility of return. Who gives much does not give but sells. Nor drain gratitude to the dregs, for when the recipient sees all return is impossible he breaks off correspondence. With many persons it is not necessary to do more than overburden them with favours to lose them altogether: they cannot repay you, and so they retire, preferring rather to be enemies than perpetual debtors. The idol never wishes to see before him the sculptor who shaped him, nor does the benefited wish to see his benefactor always before his eyes. There is a great subtlety in giving what costs little yet is much desired, so that it is esteemed the more.