14 “Before that the bramble brings forth your thorns: as though living, as though in anger, it shall drink them up”. What is the bramble? Of prickly plants it is a kind, upon which there are said to be certain of the closest thorns. At first it is a herb; and while it is a herb, soft and fair it is: but thereon there are nevertheless thorns to come forth. Now therefore sins are pleasant, and as it were they do not prick. A herb is the bramble; even now nevertheless there is a thorn.
“Before that the bramble brings forth thorns:” is before that of miserable delights and pleasures the evident tortures come forth. Let them question themselves that love any object, and to it cannot attain; let them see if they are not racked with longing: and when they have attained to that which unlawfully they long for, let them mark if they are not racked with fear. Let them see therefore here their punishments; before that there comes that resurrection, when in flesh rising again they shall not be changed.
“For all we shall rise again, but not all we shall be changed.” For they shall have the corruption of the flesh wherein to be pained, not that wherein to die: otherwise even those pains would be ended. Then the thorns of that bramble, that is, all pains and piercings of tortures shall be brought forth. Such thorns as they shall suffer that are to say, “These are they whom sometimes we had in derision:” thorns of the piercing of repentance, but of one too late and without fruit like the barrenness of thorns.
The repentance of this time is pain healing: repentance of that time is pain penal. Would you not suffer those thorns? Here be thou pierced with the thorns of repentance; in such sort that thou do that which has been spoken of, “Turned I have been in sorrow, when the thorn was piercing: my sin I have known, and mine iniquity I have not covered: I have said, I will declare against me my shortcoming to the Lord, and You have remitted the ungodliness of my heart.” Now do so, now be pierced through, be there not in you done that which has been said of certain execrable men, “They have been cloven asunder, and have not been pierced through.” Observe them that have been cloven asunder and have not been pierced through. You see men cloven asunder, and you see them not pierced through.
Behold beside the Church they are, and it does not repent them, so as they should return whence they have been cloven asunder. The bramble hereafter shall bring forth their thorns. They will not now have a healing piercing through, they shall have hereafter one penal. But even now before that the bramble produces thorns, there has fallen upon them fire, that suffers them not to see the sun, that is, the wrath of God is drinking up them while still living: fire of evil lusts, of empty honours, of pride, of their covetousness: and whatsoever is weighing them down, that they should not know the truth, so that they seem not to be conquered, so that they be not brought into subjection even by truth herself.
For what is a more glorious thing, brethren, than to be brought in subjection and to be overcome by truth? Let truth overcome you willing: for even unwilling she shall of herself overcome you....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)