John 16:4
5 Let us then not be ever seeking security here, in order that we may enjoy security there; but let us accept the labors which are in behalf of virtue, and cut off superfluities, and seek nothing more than we need, and spend all our substance on those who want. Since what excuse can we have, when God promises heaven to us, and we will not even give Him bread? When He indeed for you makes the sun to rise, and supplies all the ministry of the Creation, but thou dost not even give Him a garment, nor allow Him to share your roof? But why speak I of sun and moon? He has set His Body before you, He has given you His Precious Blood; and do you not even impart to Him of your cup? But have you done so for once? This is not mercy; as long as, having the means, you help not, you have not yet fulfilled the whole duty. Thus the virgins who had the lamps, had oil, but not in abundance. Why, you ought, even did you give from your own, not to be so miserly, but now when you give what is your Lord's, why do you count every little? Will ye that I tell you the cause of this inhumanity? When men get together their wealth through greediness, these same are slow to give alms; for one who has learned so to gain, knows not how to spend. For how can a man prepared for rapine adapt himself to its contrary? He who takes from others, how shall he be able to give up his own to another? A dog accustomed to feed on flesh cannot guard the flock; therefore the shepherds kill such. That this be not our fate, let us refrain from such feasting. For these men too feed on flesh, when they bring on death by hunger. Do you see not how God has allowed to us all things in common? If amid riches He has suffered men to be poor, it is for the consolation of the rich, that they may be able by showing mercy towards them to put off their sins. But thou even in this hast been cruel and inhuman; whence it is evident, that if you had received this same power in greater things, you would have committed ten thousand murders, and wouldest have debarred men from light, and from life altogether. That this might not take place, necessity has cut short insatiableness in such matters.
If you are pained when you hear these things, much more I when I see them taking place. How long shall you be rich, and that man poor? Till evening, but no farther; for so short is life, and all things so near their end, and all things henceforth so stand at the door, that the whole must be deemed but a little hour. What need have you of bursting storehouses, of a multitude of domestics and house-keepers? Why have you not ten thousand proclaimers of your almsdoing? The storehouse utters no voice, yet will it bring upon you many robbers; but the storehouses of the poor will go up to God Himself, and will make your present life sweet, and put away all your sins, and you shall gain glory from God, and honor from men. Why then grudgest you yourself such good things? For you will not do so much good to the poor, as to yourself, when you benefit them. You will right their present state; but for yourself you will lay up beforehand the glory and confidence which shall be hereafter. And this may we all obtain, by the grace and lovingkindness of our Lord Jesus Christ, to whom with the Father and the Holy Ghost be the glory and the might for ever. Amen.
Source: Homilies on the Gospel of John (New Advent)