Sin in an ungodly man's heart
How can we spot an evil man who has sin hidden in his heart?
Holy Bible gives us an answer. In Psalms 36:1 Sin whispers to the wicked, deep within their hearts. They have no fear of God at all.
It is therefore clear from the above mentioned verse that an ungodly man has hidden sin within his heart. He listens to this sin and meditates on it. It will eventually lead him to commit sin against Almighty God.