A simplistic view of vengeance involves the retribution of an evil deed. The first (Genesis 4:15) and last (Jude 7) mention of the word vengeance substantiates this definition. The Bible uses words like recompence (Deuteronomy 32:35), reward (Deuteronomy 32:41), punishments (Psalm 149:7), avenge (Jeremiah 46:10), revenge (Ezekiel 25:15), and repay (Romans 12:19) as descriptive words for vengeance. With this in mind, it is clear that vengeance is the just punishment as a consequence upon those who violate the laws of God. It is not the dispensing of wrath without cause but is specific punishment exacted for specific crimes committed.
Christians should first and foremost focus on their walk with the Lord. As such, believers are instructed to add virtue, knowledge, temperance, patience, godliness, brotherly kindness, and charity to their faith. However, notice that every believer is to be “giving all diligence” (with great effort, but without haste). Of all these graces mentioned, faith seems to be the most foundational of them all. Unfortunately, far too many believers never grow beyond faith, making them unable to put forth much diligence in adding the other graces. Believers should be growing in grace daily (like those listed above) and in the knowledge of our Lord and Saviour (2 Peter 3:18). The word of God remains the only viable source from whence this diligent growth springs forth (1 Peter 2:2).
