That's God's number one purpose, to make us like Christ.
There is no growth without change, and there is no change without loss.
Faithful servants never retire. You can retire from your career, but you will never retire from serving God.
Possessions only provide temporary happiness.
The love of Jesus Christ covers your sins, and it also gives you the power to let other people off the hook. You've been forgiven, and you can forgive others.
What is your assurance of salvation? The promise of God's Word. If God says it, that settles it, because God cannot lie. You can trust the promise of God's Word.