Shared ground
Paul opens by locating himself under authority: he is God’s servant and Jesus Christ’s apostle (explicit). His work has a clear aim: it serves the trust (or believing) of God’s elect and their grasp of “the truth” (explicit). That truth is not just information; it is described as fitting a life shaped by reverence and practice (explicit).
Paul also sets a message timeline (explicit): God promised “eternal life” long ago, and at the right time God made his word public through a proclaimed message that Paul says was entrusted to him by God’s directive. God is characterized as one who does not lie (explicit), so the promise is presented as dependable.
Where interpretation differs (only where needed)
Some differ on what Paul means by “God’s elect.” One reading takes it as the existing community of believers Paul serves. Another treats it as a broader category: the people God has chosen, whether or not they have come to faith yet. Either way, Paul ties his commission to their believing and their knowledge of truth (v.1).
Some also differ on the time phrase “before eternal times.” One reading takes it as “before creation,” emphasizing God’s plan before history. Another takes it as “a very long time ago,” emphasizing the promise’s deep roots without making a claim about events before the world began.
Why the disagreement exists
The pressure points come from compact phrases that can be heard in more than one way in normal language: “according to” (v.1) can express purpose (“for the sake of”), content (“in line with”), or standard (“in keeping with”). Likewise, “elect” and “before eternal times” can be read more narrowly or more expansively depending on how the surrounding Bible language is weighed.
What this passage clearly contributes
This opening ties together three strands that the letter will keep linking: authorized teaching, truth, and a life consistent with that truth (vv.1–2). It also frames the gospel as an unfolding announcement: a trustworthy God promised eternal life long ago and has now brought that promise into the open through public proclamation entrusted to an appointed messenger (v.3). The passage establishes that Paul’s message is not presented as a private idea but as a declared word under God’s command (v.3; compare Romans 1:1).