But as for you, continue in what you have learned and have become convinced of, because you know those from whom you learned it, and how from infancy you have known the Holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus.
It seems like what Paul is telling Timothy here is not to take his faith for granted, but to continue in it, and specifically in Scripture itself.
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the servant of God[a]may be thoroughly equipped for every good work.
I’m not sure what one has to go on, but there are a number of voices out there advocating something different, either a wholesale abandonment of the faith, or more likely, a modification of it, which can amount to the same thing in the end. Paul warns Timothy in both 1 and 2 Timothy of the same dangers during that time.
There’s nothing wrong with wide reading, and becoming acquainted with others’ thinking, in fact that’s good in its place. Paul himself was well acquainted with the various views of his time. But we need to remain well grounded in the truth as it is in Jesus, found in Scripture. And to do that, we can’t just pay lip service to it. We have to continue in it for ourselves.
Yes, Paul and Timothy were leaders in the church, but they weren’t doing what other Christians didn’t need to do themselves. They were to set the example in their faith and life for other Christians to follow, of course from their following of Christ tethered to Scripture and to life. They were gifted to do that, but that’s in large part what their ministry was about.
So these words by extension are for us, too. We’re to continue on in Scripture, in the gospel, in Christ. Grounded in that, so that we won’t be carried away by voices which sound compelling to others. In and through Jesus.