2 Timothy 1:5

The unfeigned faith that is in thee - Timothy had given the fullest proof of the sincerity of his conversion, and of the purity of his faith.

Which dwelt first in thy grandmother Lois - In Acts 16:1 , we are informed that Paul came to Derbe and Lystra; and behold, a certain disciple was there, named Timotheus, the son of a certain woman, who was a Jewess, and believed; but his father was a Greek. Luke, the historian, it appears, was not particularly acquainted with the family; Paul evidently was. Luke mentions the same circumstance which the apostle mentions here; but in the apostle's account there are particulars which argue an intimate acquaintance with the family and its history. Luke says Timothy's father was a Greek, consequently we may believe him to have been then in his heathen state; Paul, in mentioning the grandmother, mother, and son, passes by the father in silence; which intimates that either the father remained in his unconverted state, or was now dead. Lois and Eunice are both Grecian, and indeed heathen names; hence we are led to conclude that, although Timothy's mother was a Jewess according to St. Luke, yet she was a Grecian or Hellenist by birth. Lois, the grandmother, appears to have been the first convert to Christianity: she instructed her daughter Eunice, and both brought up Timothy in the Christian faith; so that he had a general knowledge of it before he met with St. Paul at Lystra. There, it appears the apostle was the instrument of the conversion of his heart to God; for a man may be well instructed in Divine things, have a very orthodox creed, and yet his heart not be changed. Instruction precedes conversion; conversion should follow it. To be brought up in the fear of God is a great blessing; and a truly religious education is an advantage of infinite worth.