V. Let us then make the best use possible of the opportunity
Let us then, dearly-beloved, lay hold upon this most sacred unity in all its blessed integrity and engage in the solemn fast with the concordant purpose of a good will. Nothing hard, nothing harsh is asked of anyone, nor is anything imposed beyond our strength, whether in the discipline of abstinence or in the amount of alms. Each knows what he can and what he cannot do: let every one pay his quota, assessing himself at a just and reasonable rate, that the sacrifice of mercy be not offered sadly nor reckoned among losses.
Let so much be expended on pious work, as will justify the heart, wash the conscience, and in a word profit both giver and receiver. Happy indeed is that soul and truly to be admired which in its love of doing good fears not the failing of the means, and has no distrust that He will give him money still to spend, from Whom he had what he spent in the past. But because few possess this greatness of heart, and yet it is truly a pious thing for each one not to forsake the care of his own, we, without prejudice to the more perfect sort, lay down for you this general rule and exhort you to perform God's bidding according to the measure of your ability.
For cheerfulness becomes the benevolent man, who should so manage his liberality that while the poor rejoice over the help supplied, home needs may not suffer. “And He that ministers seed to the sower, shall both provide bread to be eaten and multiply your seed and increase the fruits of your righteousness.” On Wednesday and Friday therefore let us fast; and on Saturday keep vigil all together in the presence of the most blessed Apostle Peter, by whose merits and prayers we are sure God's mercy will be vouchsafed to us in all things through our Lord Jesus Christ, Who lives and reigns for ever and ever. Amen.
Source: Sermons (New Advent)