Since we are looking forward to the return of Jesus Christ—the day when the new heaven and earth, the home of righteousness, will be revealed—we must live now as those who belong to this kingdom.
When talking about being found without spot, blameless, and at peace, Peter gives a very high moral standard to Christian believers. He does not cut corners; he encourages and demands even wholehearted effort and progress in godliness. Knowing the weakness of our sinful natures, we can be prompted to ask why this is the case.
The answer must surely be that Peter thinks it is possible for Christians to achieve this standard. That is to say, he considers the promises about what Christ will do when he returns in glory to have the power to change us now and enable us to do things that we would otherwise be unable to do. Peter is not saying that we must be perfect in order to be sure of salvation, but he is encouraging us to pursue moral purity, to be holy as the Lord our God is holy (see 1 Peter 1:16).
Christian believers are called to give up certain jobs. If you are a thief, you must now stop stealing and find another way to support your family (Ephesians 4:28). If you are a prostitute or a gang member, likewise you must find another way of earning an income. Even if your work brings you lots of money, you cannot continue to do what is opposed to God’s will. This will be hard, especially if it results in a time of poverty or risk to your life but if you have been gripped by the promises of God, then the Spirit will enable you to let go of sin and lead an honest life.
14 Therefore, beloved, since you are waiting for these, be diligent to be found by him without spot or blemish, and at peace.