Pursue peace with everyone, as well as holiness, without which no one will see the Lord. — Hebrews 12:14

That's a sobering word, but it doesn't send you to self-effort. You must be born again to even see the kingdom. Holiness is not something you produce; it's what you're called to in Christ, who chose you before the foundation of the world to be holy and blameless. Be holy as He is holy — a command that's also a promise.