Nicomachean Ethics by Aristóteles — Read

Liberality, of which we will next speak, seems to be moderation in the matter of wealth. What we commend in a liberal man is his behaviour, not in war, nor in those circumstances in which temperance is commended, nor yet in passing judgment, but in the giving and taking of wealth, and especially in the giving -- wealth meaning all those things whose value can be measured in money.

But both prodigality and illiberality are at once excess and defect in the matter of wealth.