Taken from Desiring God.org . . .
“But sinful anger does not bear redemptive fruit. Rather, it leaves us with a grey, burned-over barrenness of exasperated frustration. It produces a sour feeling in the pit of our gut. Sinful anger alienates us from God. It does not move us toward acts of faith and love and true justice, but rather toward acts of selfishness like sullen withdrawal, irritability, rudeness, obstinacy, and bitterness. Sinful anger is characterized by the self-oriented grief of self-pity, not godly grief over evil. And it produces the cancer of cynicism that eats away at faith, eroding our desire to pray.”
~ Jon Bloom