1 Peter 1:15, 16
We should be holy because God wants us to be holy. He commands it. He says, “As He which has called you is holy, so be you holy in all manner of conversation; because it is written, ‘Be you holy; for I am holy'” (1 Pet. 1:15, 16). God is in earnest about this. It is God’s will and it cannot be evaded. Just as a man wants his watch to keep perfect time, his work to be accurate, wants his friends to be steadfast, his children to be obedient, his wife to be faithful, so God wants us to be holy.
We should be holy because Jesus died to make us holy. He wants a holy people. For this He prayed. “Sanctify them through your truth” (John 17:17). For this He died: “Who gave Himself for us, that He might redeem us from all iniquity, and purify unto Himself a peculiar people” (Titus 2:14). He “loved the church, and gave Himself for it; that He might sanctify and cleanse it” (Ephesians 5:25-26). Let not His precious Blood be spent in vain.
We should be holy in order that we may be made useful. Who have been the mightiest men of God of all ages? They have been holy men, men with clean hearts on fire with love to God and man. So long as there are any roots of sin in the heart the Holy Spirit cannot have all His way in us, and our usefulness is hindered. But when our hearts are clean the Holy Spirit dwells within, and then we have power for service. To be holy and useful is possible for each one of us.
Again, we should be holy so that we may be safe. Sin in the heart is more dangerous than gunpowder in the cellar. Before the disciples got the blessing of a clean heart and the baptism of the Holy Spirit they forsook their Master and fled.
Finally, we should be holy because we are most solemnly assured that without holiness “no man shall see the Lord” (Hebrews 12:14).
I bless Him that years ago He awakened me to the infinite importance of this matter, sent holy people to testify to and explain the experience, enabled me to consecrate my whole being to Him and seek Him with all my heart, and He gave me the blessing.
Will you have it my comrade? If so, receive Jesus as your Sanctifier just now.
Samuel Logan Brengle, The Way of Holiness