Man does not change in order to be saved, but true salvation always brings about an evident change in the life of the new believer. Perhaps the change is less noticeable in some new believers and more noticeable in others; however, no change means no salvation. The change is not always an immediate outward change because it involves a change of the inward nature. A person who trusts Christ for salvation becomes a new creature (Galatians 6:15). It might be best to consider how this could be likened to a dog (Matthew 15:26-27) becoming a sheep (John 10:16). A new man now dwells within the new Christian to help combat and defeat the old sinful nature (Ephesians 4:22-24). Salvation is not merely the turning over of a new leaf; it is a new birth (John 3:3) where one is passed from spiritual death to spiritual life (John 5:24).
The believer is to allow no place for bitterness within his life. The book of Ephesians directly associates bitterness with the sins of wrath, anger, clamour, evil speaking, and malice. Each of these sins grieves the Spirit of God and ought to grieve the believer. As such, Christians are admonished to put away all bitterness. As bitterness shows itself in the depths of our hearts, we ought to immediately seek the Lord and plead for His help in removing it by its root. In a similar passage (Colossians 3:8), we are admonished to “put off” many of these other sins mentioned. Always keep in mind that bitterness does not edify the believer or those around him, nor does it glorify the Lord. Simply choose to obey God by putting away and putting off bitterness.
A good Bible student often incorporates many of the same tactics as a good detective. Defining Bible words involves such a task. No single verse specifically defines the word bitterness. Yet, a careful study of a few verses will help to bring the pieces together and to provide understanding. According to Isaiah, bitterness and peace are at opposite ends of the emotional spectrum (Isaiah 38:17). Proverbs associates the word bitter directly to the word sharp (Proverbs 5:4). And, lastly, the word bitter is connected to the word affliction (2 Kings 14:26, Lamentations 1:4). Using these scriptural clues, a good student will understand bitterness to be a sharp affliction. Additionally, consider the connection between the words bitter and bite, making bitterness a sharp affliction with bite. Bitterness always begins on the inside of an individual and, as we will learn, eventually works its way to the outside for others to see.
