Conviction is for something, like justice and fair treatment, while anger and resentment are against something, like injustice or unfair treatment. Those who hate injustice want retribution and triumph, not fairness; they fantasize about punishment of their unjust opponents, who must submit to humiliation. The fantasies of those who love justice are of equality, harmony, and triumphant good.
Being for something generates energy and creates positive feelings and relationships, while being against something depletes energy, creates negative feelings, and usually has deleterious effects on relationships — if you’re resentful about something at work, you won’t be as sweet to your kids when you get home.
— Steven Stosny You Don’t Have to Take It Anymore, p. 117