John Chrysostom
"To Timothy, a true son in the faith." This too is said for consolation. Indeed, if he showed such faith that he became Paul's child, and not simply a child but a true child, then he will preserve faith also concerning the future promises. It does not belong to faith to fall away or become troubled, even when something happens that seems contrary to the promise. But he was Paul's son, and a true son, yet he was not of the same essence. What then? Was he of another kind? But he did not proceed from Paul, you will say. Therefore this does not indicate from whom he proceeded. What then? Was he of another essence? This is not indicated either. Having said "child," the Apostle deliberately added the word "in the faith," to show that he was his true son and had come from him.
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He differed in nothing from Paul. In faith there was no difference between them. Among men, according to the laws of nature, it happens that a son resembles his father. Yet not to such a degree as when this likeness has its ground in God, for then the likeness is more perfect. Here, though they are the same according to essence, they differ from one another in many other respects. They differ in color, appearance, understanding, age, character, and properties of soul and body, outward and many others. Or they are sometimes unlike and sometimes alike. But there, in God, none of these differences has place. The expression "according to the commandment" is stronger than "called," as one may learn from other places. The Apostle used an expression similar to "Timothy, a true child" in the Epistle to the Corinthians, when he said: "I begot you in Christ Jesus" (1 Cor 4:15), that is, according to faith. He added the word "true" because he wished to express that Timothy had a perfect and greater likeness to him than others had. Besides this, he wished to express his love and his great affection for him. Here again "in" is used with the word faith: he says, "a true child in the faith." Notice also what praise this contains for Timothy, if the Apostle calls him not only his son, but his true son. "Grace, mercy, and peace from God our Father and Christ Jesus our Lord." Why, at the beginning of the other Epistles, does he nowhere place the word mercy, but only here? This too comes from his great love for Timothy. He prays for greater things for his son, fearing and trembling for him. He was so anxious for him that he wrote to him about matters concerning bodily needs, something he never did otherwise. For example, he said: "Use a little wine for your stomach's sake and your frequent infirmities" (1 Tim 5:23). For instructors need greater condescension. "From God," he says, "our Father, and Christ Jesus our Lord." Here again there is consolation. Indeed, if God is Father, then He cares for men as for children. Hear what Christ says: "What man is there among you who, if his son asks for bread, will give him a stone?" (Mt 7:9).