From today’s Office of Readings, a homily of St. Gregory Nazianzen:

Is it not God who asks you now in your turn to show yourself generous above all other creatures and for the sake of all other creatures? Because we have received from him so many wonderful gifts, will we not be ashamed to refuse him this one thing only, our generosity? Though he is God and Lord he is not afraid to be known as our Father. Shall we for our part repudiate those who are our kith and kin?
Brethren and friends, let us never allow ourselves to misuse what has been given us by God’s gift. If we do, we shall hear Saint Peter say: Be ashamed of yourselves for holding on to what belongs to someone else. Resolve to imitate God’s justice, and no one will be poor. Let us not labour to heap up and hoard riches while others remain in need. If we do, the prophet Amos will speak out against us with sharp and threatening words: Come now, you that say: When will the new moon be over, so that we may start selling? When will the sabbath be over, so that we may start opening our treasures?
Let us put into practise the supreme and primary law of God. He sends down rain on just and sinful alike, and causes the sun to rise on all without distinction. To all earth’s creatures he has given the broad earth, the springs, the rivers and the forests. He has given the air to the birds, and the waters to those who live in the water. He has given abundantly to all the basic needs of life, not as a private possession, not restricted by law, not divided by boundaries, but as common to all, amply and in rich measure. His gifts are not deficient in any way, because he wanted to give equality of blessing to equality of worth, and to show the abundance of his generosity.