Nobody likes to spend time around those who act in a rude or insulting manner. Most people would rather spend people-time with those who focus on saying nice things. However, the truth is that one is just as spiritually dangerous to one's well-being as the other. This is why the Bible warns us to “meddle not with him that flattereth with his lips.” Flattery is directly connected to deceit and covetousness; therefore, God intends for His warning to help Christians avoid people who say nice things deceitfully. These people intend to take advantage of their target. Far too many people have been mistreated and lied to by others whom they thought to be dear friends. It is best to avoid those with flattering lips.
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.