The Bible always tells us to live a life in holiness before the Lord, and is that we can not pretend to be followers of Christ if we live a life under sin, if we are really Christians we have to live as such, as the Scriptures teach us, our whole Christian life is based on living for the Lord and living in the Lord.
The apostle Peter wrote:
8 For if you possess these qualities in increasing measure, they will keep you from being ineffective and unproductive in your knowledge of our Lord Jesus Christ.
9 But whoever does not have them is nearsighted and blind, forgetting that they have been cleansed from their past sins.
10 Therefore, my brothers and sisters, make every effort to confirm your calling and election. For if you do these things, you will never stumble,
2 Peter 1:8-10
We are partakers of a divine nature, and that is why in the verses before these that we just quoted the apostle Peter mentions a series of qualities that we must possess:
5 For this very reason, make every effort to add to your faith goodness; and to goodness, knowledge;
6 and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness;
7 and to godliness, mutual affection; and to mutual affection, love.
2 Peter 1:5-7
Peter tells us that if all these things are in us they will not let us have an idle life, nor we will be without enough fruit in the knowledge of our Beloved Lord Jesus Christ. But, there is a warning to those who, being within the flock, do not possess these qualities and the verse eight says that those who do not possess them have very short sight, are blind, do not purify themselves of their former sins, but live a false life or double moral. We must run from that brothers, we must run soon.
What we must strive for in this wide-ranging career is to be firm in the Lord, this must be our greatest concern in the Christian life, since we have been called to this.
If we keep all these things as paramount in our lives, then we will never fall, but we will stand firm in the Lord.