Recently, I was reflecting on the challenge of maintaining a positive attitude in light of difficulties. Sometimes all the struggles--and evil--of the world can wear on even the most devoted optimists. And sometimes, simple determination to be happy in itself cannot dispel the tenebrous foes of peace in one's soul.
Romans 12:21 came to mind, "Do not be overcome by evil, but overcome evil with good." Generally, I have categorized this verse with verses about loving enemies and doing good to those who hate you--rather reactionary, defensive advice to avoid being overtaken by the attrition of evil.
I realize I need to move that verse into a new category of offensive tactics. For every setback, evil, or unkindness I encounter, I should not just react calmly to that situation without hate, but fight back on the other side of the board with a commensurate attack of goodness and kindness in unrelated situations to brighten the lives of others.
The Psalmist said, "Surely goodness and mercy shall follow me all the days of my life." He was claiming God's blessing on his life, true, but it seems he also believed in leaving a trail of God's goodness and mercy behind him.
"And let the peace of God rule in your hearts." --Colossians 3:15