2 Timothy 2:19

"Nevertheless," he says, "the foundation of God standeth sure, having this seal, The Lord knoweth them that are His. And, Let every one that nameth the name of the Lord depart from iniquity." He shows that even before they were subverted, they were not firm. For otherwise, they would not have been overthrown at the first attack, as Adam was firm before the commandment. For those who are fixed not only are not harmed through deceivers, but are even admired. And he calls it "sure," and a "foundation"; so ought we to adhere to the faith; "having this seal, The Lord knoweth them that are His." What is this? He has taken it from Deuteronomy; that is, Firm souls stand fixed and immovable. But whence are they manifest? From having these characters inscribed upon their actions, from their being known by God, and not perishing with the world, and from their departing from iniquity. "Let every one," he says, "that nameth the name of the Lord depart from iniquity." These are the distinguishing marks of the foundation. As a foundation is shown to be firm, and as letters are inscribed upon a stone that the letters may be significant. But these letters are shown by works, "Having," he says, "this seal" fixed thereon, "Let every one that nameth the name of the Lord depart from iniquity." Thus if any one is unrighteous, he is not of the foundation. So that this too is of the seal, not to do iniquity.