2 Timothy 1:5

"When I call to remembrance the unfeigned faith that is in thee." This is another commendation, that Timothy came not of Gentiles, nor of unbelievers, but of a family that served Christ from the first. (Acts xvi. 1, Acts xvi. 3.) "Which dwelt first in thy grandmother Lois, and thy mother Eunice." For Timothy, it says, "was the son of a certain woman which was a Jewess, and believed." How a Jewess? how believing? Because she was not of the Gentiles, "but on account of his father, who was a Greek, and of the Jews that were in those quarters, he took and circumcised him." Thus, as these mixtures of Jews and Gentiles took place, the Law began gradually to be dissolved. And mark in how many ways he shows that he did not despise him. "I serve God," he says, "I have a true conscience" for my part, and thou hast thy "tears," and not thy tears only, but for "thy faith," because thou art a laborer for the Truth, because there is no deceit in thee. As therefore thou showest thyself worthy of love, being so affectionate, so genuine a disciple of Christ; and as I am not one of those who are devoid of affection, but of those who earnestly pursue the Truth; what hindered me from coming to thee? "And I am persuaded that in thee also." From the beginning, he means, thou hast had this excellency. Thou receivedst from thy forefathers the faith unfeigned. For the praises of our ancestors, when we share in them, redound also to us. Otherwise they avail nothing, but rather condemn us; wherefore he has said, "I am persuaded that in thee also." It is not a conjecture, he means, it is my persuasion; I am fully assured of it. If therefore from no human motive thou hast embraced it, nothing will be able to shake thy faith.