I. Our goods are given us not as our own possessions but for use in God's service
Observing the institutions of the Apostles' tradition, dearly beloved, we exhort you, as watchful shepherds, to celebrate with the devotion of religious practice that day which they purged from wicked superstitions and consecrated to deeds of mercy, thus showing that the authority of the Fathers still lives among us, and that we obediently abide by their teaching. Inasmuch as the sacred usefulness of such a practice affects not only time past but also our own age, so that what aided them in the destruction of vanities, might contribute with us to the increase of virtues.
And what so suitable to faith, what so much in harmony with godliness as to assist the poverty of the needy, to undertake the care of the weak, to succour the needs of the brethren, and to remember one's own condition in the toils of others. In which work He only who knows what He has given to each, discerns aright how much a man can and how much he cannot do. For not only are spiritual riches and heavenly gifts received from God, but earthly and material possessions also proceed from His bounty, that He may be justified in requiring an account of those things which He has not so much put in our possession as committed to our stewardship.
God's gifts, therefore, we must use properly and wisely, lest the material for good work should become an occasion of sin. For wealth, after its kind and regarded as a means, is good and is of the greatest advantage to human society, when it is in the hands of the benevolent and open-handed, and when the luxurious man does not squander nor the miser hoard it; for whether ill-stored or unwisely spent it is equally lost.
Source: Sermons (New Advent)