a trust: something valuable handed over to another person for safekeeping, to be guarded undamaged and given back faithfully
In everyday Greek of the New Testament era this was a hard business term. A deposit was money, goods, or even a person placed into someone else's care under a binding agreement: the keeper had to preserve it untouched and return it intact on demand. To embezzle or damage a deposit was one of the most shameful betrayals imaginable, and ancient writers often spoke of it as an offense against the gods themselves.
The Pastoral Letters take this weighty word and apply it to spiritual realities. The keeper does not own what he holds; he is trusted with it, accountable to the one who handed it over, and bound to guard it without loss. That is why this word always travels with the command to guard.
In two of its three appearances the thing entrusted is plainly the gospel that Paul handed to Timothy to protect and pass on. The third (2 Timothy 1:12) is debated: the trust there may again be the gospel, kept safe by God, or it may be Paul's own life placed into God's keeping. Either way the word means the same thing, a trust that must be faithfully guarded; only what is being guarded is in question.
In 2 Timothy 1:12 the phrase translated "my deposit" is grammatically open: it can mean either "what God entrusted to me" (the gospel) or "what I entrusted to God" (Paul's own life or soul), and that choice decides what the guarded trust refers to here.
- majorityThe trust is the gospel entrusted to Paul, which God is able to keep safe; the same trust as in the other two verses, read for consistency and from the surrounding gospel language.; M. Wolter, Die Pastoralbriefe als Paulustradition (FRLANT 146; Vandenhoeck & Ruprecht, 1988), 116-118; I. H. Marshall (with P. H. Towner), The Pastoral Epistles (ICC; T&T Clark, 1999), 712-714; P. H. Towner, The Letters to Timothy and Titus (NICNT; Eerdmans, 2006), 470-473
- minorityThe trust is Paul's own life or soul, which he has placed into God's keeping to be preserved until the final Day; supported by the unusual "my", the change of guardian to God, the end-time horizon, and the echo of "into your hands I commit my spirit" (Psalm 31:5).; J. Calvin, Commentaries on the Epistles to Timothy, Titus, and Philemon (ET W. Pringle; Calvin Translation Society, 1856), ad 2 Tim 1:12; W. D. Mounce, Pastoral Epistles (WBC 46; Nelson, 2000), 487-490; N. J. D. White, The Expositor's Greek Testament (Hodder & Stoughton, 1910), 4:159