Born in Lystra (Asia Minor). He was the son of a Jewish mother (Eunice) and a Greek father. He grew up in a multicultural tension, not fully belonging to either the Jewish or the Gentile world.
Though his father was Greek, he was raised in the Scriptures by his mother and grandmother (Lois). He had a "sincere faith" that was modeled for him at home long before he met Paul.
He was formed by Quiet Observation. When Paul first visited Lystra, he was stoned and left for dead. Timothy likely witnessed this. He saw the cost of the Gospel before he ever committed to the mission.