It’s essential to counsel one other with this truth: Now that we are believers in Christ, we need to discipline ourselves to re-orient every part of our lives under 2 Corinthians 5:14–15: “For the love of Christ controls us, having concluded this, that one died for all, therefore all died; and He died for all, so that they who live might no longer live for themselves, but for Him who died and rose again on their behalf.”
We need to continually remind each other that the saving gospel of Christ provides not only security for eternity (as substantial as that is), but also explains why we must exchange our self-centeredness for the joy of living for the One who died and rose again for us.
We need to encourage each other to preach the gospel to ourselves as we learn to put off the old life and put on the new (Ephesians 4:17–32). An excellent resource is A Gospel Primer for Christians by Milton Vincent. Make regular reading of portions of this small, and extremely helpful, book part of your weekly reading.