The Bible always serves as the best source for adequately defining a Bible word. According to Joshua 7:19, confession is connected to the act of telling what a person has done—refusing to keep it hidden. Joshua told Achan to give “glory to the LORD God of Israel, and make confession unto him; and tell me now what thou hast done; hide it not from me.” Psalm 32:5 identifies confession as acknowledging a matter—refusing to hide it. Additionally, Proverbs 28:13 defines confession as the opposite of covering one's sin. In John 1:20, the word confessed appears twice with a defining phrase in between— “and denied not.” In the same manner, Acts 19:18 demonstrates that those who “confessed” “came . . . and shewed their deeds.” The scriptural evidence points to confession as the willingness to make known that which could otherwise be private, personal, or hidden. Keep in mind that regardless of one's willingness to confess, nothing can be hidden from the Lord.
“Out of the abundance of the heart the mouth speaketh” (Matthew 12:34). As such, the words that proceed from our mouths provide helpful insights into the condition of our hearts. A man can only deceive with his words for so long; eventually, his speech exposes the reality of his heart's condition. The Bible reinforces this truth when it says, “the words of the pure are pleasant words” (Proverbs 15:26). The Bible also identifies words of praise to God as “pleasant” words (Psalm 135:3; Psalm 147:1). Impure words manifest an unpleasantness. Whereas, a pure heart utters pure words and speaks of the Lord and of His goodness.
