I. The prosperous must show forth their thankfulness to God, by liberality to the poor and needy
The transcendent power of God's grace, dearly beloved, is indeed daily effecting in Christian hearts the transference of our every desire from earthly to heavenly things. But this present life also is passed through the Creator's aid and sustained by His providence, because He who promises things eternal is also the Supplier of things temporal. As therefore we ought to give God thanks for the hope of future happiness towards which we run by faith, because He raises us up to a perception of the happiness in store for us, so for those things also which we receive in the course of every year, God should be honoured and praised, who having from the beginning given fertility to the earth and laid down laws of bearing fruit for every germ and seed, will never forsake his own decrees but will as Creator ever continue His kind administration of the things that He has made.
Whatever therefore the cornfields, the vineyards and the olive groves have borne for man's purposes, all this God in His bounteous goodness has produced: for under the varying condition of the elements He has mercifully aided the uncertain toils of the husbandmen so that wind, and rain, cold and heat, day and night might serve our needs. For men's methods would not have sufficed to give effect to their works, had not God given the increase to their wonted plantings and waterings.
And hence it is but godly and just that we too should help others with that which the Heavenly Father has mercifully bestowed on us. For there are full many, who have no fields, no vineyards, no olive-groves, whose wants we must provide out of the store which God has given, that they too with us may bless God for the richness of the earth and rejoice at its possessors having received things which they have shared also with the poor and the stranger. That garner is blessed and most worthy that all fruits should increase manifold in it, from which the hunger of the needy and the weak is satisfied from which the wants of the stranger are relieved, from which the desire of the sick is gratified.
For these men God has in His justice permitted to be afflicted with various troubles, that He might both crown the wretched for their patience and the merciful for their loving-kindness.
Source: Sermons (New Advent)