10 For “Whoever desires to love life and see good days, let him keep his tongue from evil and his lips from speaking deceit; 
here is quoting Psalm 34: 12-16, supporting the idea that those who do not seek
after their own revenge but “bless” others will themselves “obtain a blessing”.
In this section, Peter is writing about suffering for righteousness’ sake. His
stance is to have unity of mind, sympathy, brotherly love, a tender heart, and
a humble mind (v 8). These things should always be carried with us as
Christians, even into suffering, no matter the degree of which we face. When we
face persecution, we are not to repay harm with harm, but bless those who do us
harm, which is a very counter cultural stance. Do not repay evil with evil but
love everyone. Hold your tongues and keep from speaking evil on those who
persecute you. Stay rooted in prayer, and faith.