To be holy means to be clean or set apart for Jehovah's service. Holiness is not a choice, but an obligation: we must be holy in all our conduct as Jehovah our heavenly Father is holy. Yet how can we imitate God's holiness since we're imperfect, but he is not?
Although we're imperfect sinners, we manifest holiness by obediently preaching the kingdom good news and setting an example in our conduct (Philippians 2:15). However, when we unintentionally commit sin, we exemplify holiness by showing true remorse and shunning "practices that dishonor Jehovah."
Help us, O God of our salvation,
For the sake of your glorious name;
Rescue us and forgive our sins for the sake of your name. (Psalm 79:9)
Our worship cannot be clean if we do things that Jehovah hates, such as actions that are immoral, violent, or connected with demonism. (Romans 6:12-14; 8:13) However, it would also displease Jehovah if we allowed ourselves to be entertained by such things.
The Bible encourages us to be morally, spiritually and physically clean.