What is Sin

He removed the foreign altars and the high places, smashed the sacred stones and cut down the Asherah poles. He commanded Judah to seek the Lord, the God of their ancestors, and to obey his laws and commands. He removed the high places and incense altars in every town in Judah, and the kingdom was at peace under him - 2 Chronicles 14:3-5.

Sinful

Simply attending worship services is not enough to secure God's peace. Becoming more active in church attendance or good deeds will still leave us in turmoil if we failed to eliminate sinful practices from our lives. 

Like Asa, we must actively remove anything that is offensive to God.

We should continually ask God to help us remove any source of temptation from our lives.