4 You see, that what I am constantly saying, is shown in this case also? When we have proved that our mind is made perfect, and have shown that we disregard earthly things, then earthly things also are given to us; but not before; lest being bound to them already, receiving them we should be bound still. Loose yourself from your slavery first (He says), and then receive, that you may receive no longer as a slave, but as a master. Despise riches, and you shall be rich. Despise glory, and you shall be glorious. Despise the avenging yourself on your enemies, and then shall you attain it. Despise repose, and then you shall receive it that in receiving you may receive not as a prisoner, nor as a slave, but as a freeman.
For as in the case of little children, when the child eagerly desires childish playthings, we hide them from him with much care, as a ball, for instance, and such like things, that he may not be hindered from necessary things; but when he thinks little of them, and no longer longs for them, we give them fearlessly, knowing that henceforth no harm can come to him from them, the desire no longer having strength enough to draw him away from things necessary; so God also, when He sees that we no longer eagerly desire the things of this world, thenceforward permits us to use them. For we possess them as freemen and men, not as children.
For [in proof] that if you despise the avenging yourself on your enemies, you will then attain it, hear what he says, “If your enemy hunger, feed him; if he thirst, give him drink,” and he added, “for in so doing, you shall heap coals of fire on his head.” And again, that if you despise riches, you shall then obtain them, hear Christ saying, “There is no man which has left father, or mother, or house, or brethren, who shall not receive an hundredfold, and shall inherit everlasting life.” And that if you despise glory, you shall then attain it, again hear Christ Himself saying, “He that will be first among you, let him be your minister.” And again, “For whosoever shall humble himself, he shall be exalted.”
What do you say? If I give drink to mine enemy, do I then punish him? If I give up my goods, do I then possess them? If I humble myself, shall I then be exalted? Yea, He says, for such is My power, to give contraries by means of contraries. I abound in resources and in contrivances: be not afraid. The 'Nature of things' follows My will: not I attend upon Nature. I do all things: I am not controlled by them: wherefore also I am able to change their form and order.
Source: Homilies on the Epistle to the Hebrews (New Advent)