1. Christ suffered here on earth. Now you must be ready to suffer as he did, because suffering shows that you have stopped sinning.
2. It means you have turned from your own desires and want to obey God for the rest of your life.
3. You have already lived long enough like people who don't know God. You were immoral and followed your evil desires. You went around drinking and feasting and carrying on. In fact, you even worshipped disgusting idols.