27 Nor let those persons flatter themselves that they need repent the less, who, although they have not polluted their hands with abominable sacrifices, yet have defiled their conscience with certificates. That profession of one who denies, is the testimony of a, Christian disowning what he had been. He says that he has done what another has actually committed; and although it is written, “You cannot serve two masters,” he has served an earthly master in that he has obeyed his edict; he has been more obedient to human authority than to God.
It matters not whether he has published what he has done with less either of disgrace or of guilt among men. Be that as it may, he will not be able to escape and avoid God his judge, seeing that the Holy Spirit says in the Psalms, “Your eyes saw my substance, that it was imperfect, and in Your book shall all men be written.” And again: “Man sees the outward appearance, but God sees the heart.” The Lord Himself also forewarns and prepares us, saying, “And all the churches shall know that I am He which searches the reins and the heart.” He looks into the hidden and secret things, and considers those things which are concealed; nor can any one evade the eyes of the Lord, who says, “I am a God at hand, and not a God afar off.
If a man be hidden in secret places, shall not I therefore see him? Do not I fill heaven and earth?” He sees the heart and mind of every person; and He will judge not alone of our deeds, but even of our words and thoughts. He looks into the minds, and the wills, and conceptions of all men, in the very lurking-places of the heart that is still closed up.
Source: The Treatises of Cyprian (New Advent)