Psalms 9:12

He also touches on an important truth here: there is no murder committed that goes unpunished and is not fully avenged. Moses indicates as much in Genesis in the words "I will avenge your blood." This is proof of God's boundless providence, of his intense care. Yet if he does not promptly take vengeance, do not be surprised: he gives the sinner the opportunity of repentance.

For He promised to confess before His Father those who should confess His name before men; but declared that He would deny those who should deny Him, and would be ashamed of those who should be ashamed to confess Him. And although these things are so, some of these men have proceeded to such a degree of temerity, that they even pour contempt upon the martyrs, and vituperate those who are slain on account of the confession of the Lord, and who suffer all things predicted by the Lord, and who in this respect strive to follow the footprints of the Lord's passion, having become martyrs of the suffering One; these we do also enrol with the martyrs themselves. For, when inquisition shall be made for their blood, and they shall attain to glory, then all shall be confounded by Christ, who have cast a slur upon their martyrdom.

"For requiring their blood He hath remembered" [Psalm 9:12]. As if they, who were sent to preach the Gospel, should make answer to that injunction which has been mentioned, "Show forth His wonders among the heathen," and should say, "O Lord, who hath believed our report?" and again, "For Thy sake we are killed all the day long;" the Psalmist suitably goes on to say, That Christians not without great reward of eternity will die in persecution, "for requiring their blood He hath remembered." But why did he choose to say, "their blood"? Was it, as if one of imperfect knowledge and less faith should ask, How will they "show them forth," seeing that the infidelity of the heathen will rage against them; and he should be answered, "For requiring their blood He hath remembered," that is, the last judgment will come, in which both the glory of the slain and the punishment of the slayers shall be made manifest? But let no one suppose "He hath remembered" to be so used, as though forgetfulness can attach to God; but since the judgment will be after a long interval, it is used in accordance with the feeling of weak men, who think God hath forgotten, because He doth not act so speedily as they wish. To such is said what follows also, "He hath not forgotten the cry of the poor:" that is, He hath not, as you suppose, forgotten. As if they should on hearing, "He hath remembered," say, Then He had forgotten; No, "He hath not forgotten," says the Psalmist, "the cry of the poor."