Victorinus of Poetovio
This order also, the seventh class, shows wealthy people, believers who possess rank, but who believe as wealthy people do. They interpret Scripture in the bedchamber, yet outside the house no one knows whether they are such. They boast, asserting that they know everything. They are marked by the self-confidence that comes from learning, but they are empty of works. Therefore He says to them that they are neither cold nor hot. That is, they are neither unbelievers nor believers, for they are all things to all men. Therefore the one who is neither cold nor hot is necessarily lukewarm, so that he provokes vomiting. "I will vomit you," He says, "out of My mouth" (Rev 3:16). Vomit is hateful and hidden from no one. So also are people of this kind when they are rejected by God.
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But because now is the time of repentance, He says: "I counsel you to buy from Me gold refined by fire" (Rev 3:18). That means: if you can in any way endure something for the Lord's name. "Anoint your eyes with eye salve" means that you should strive to fulfill in deed what you have freely understood through Scripture. Therefore, if such people turn from a great fall to great repentance, they can not only benefit themselves. They are also able to benefit many. He promised them no small reward, but a seat upon the throne of the Judge.