1 Peter 1:15

But like the Holy One who called you, be holy yourselves in all your conduct (be set apart from the world by your godly character and moral courage) because it is written, “You shall be Holy (set apart), for I am Holy.”

God calls us to be set apart and Holy before Him as He is Holy. We must monitor our thoughts, actions, words, and behavior. We must make ourselves behave and not let the flesh control us but our spirit. God calls us to be His example here on earth, requiring us to have good character.