Don't let anyone think less of you because you are young. Be an example to all believers in what you say, in the way you live, in your love, in your faith, and in your purity.— 1 Timothy 4:12
The Bible specifically warns against bitterness: “See to it that no one falls short of the grace of God and that no bitter root grows up to cause trouble and defile many.” (Hebrews 12:15)
'But you . . . belong to God; so run from all these evil things, and follow what is right and good. Pursue a godly life, along with faith, love, perseverance, and gentleness.' 1 Timothy 6:11