In both the Old and New Testaments, God's people are commanded to be holy. What does holiness look like, though? How do we live holy lives, when we have inherited such a sinful nature from our ancestors?
The command to be holy is a very unique command that God has given to His people. God makes it quite clear that His people are to be holy because He, Himself, is holy (Leviticus 19:2; 1 Peter 1:16). However, God did not command us to be omnipotent, because He is all-powerful. He also did not command us to be omniscient, because He is all-knowing. He also did not command us to be omnipresent, because He is omnipresent. These would all be impossible, since we are finite creatures. However, God commanded us to be holy, because He is holy. I do not believe that He would have commanded us to do this if it were impossible. So how do we live a holy life? I believe there are three things that we should do to help us live a holy life. They can be remembered by the acronym "O.I.L.".
First, we should obey God. This represents the "O" in our acronym. We should strive every day to give 100% to God. If God says to do it, then do it. If God says not to do it, don't do it. God is not going to command us to do something that He does not approve of. On the other hand, God is also not the Big Man in the sky who tries to take away our fun. When He tells us to do something, He has a reason. Likewise, when He tells us not to do something, He also has a reason for this.
Second, we should imitate Christ. This stands for the "I" in our acronym. Christ lived a perfect, holy life. We should follow the example that He has set for every aspect of our lives. We should strive each and every day to imitate Him.
Third, we should love. This stands for the "L" in our acronym. We are commanded in Scripture to love God with all of our hearts, souls, mind, and strength (Deuteronomy 6:5; Luke 10:27). We are also commanded to love our neighbors as ourselves (Leviticus 19:18; Mark 12:31). When we do this, we have acted in obedience to God and are imitating Christ. The moral of the story is to just say no to sin, and obey God. God would not have commanded us to be holy if it were truly impossible. I believe that He will help us to keep this command.