Anger
Anger describes the kind of anger that "slowly burns in your heart." This anger usually slows down to a slow vindictiveness. Often filled with self-pity, this anger is focused toward oneself - until it is released. Unfortunately, because some of the more violent signs are missing, this anger can remain unnoticed for a long time except from those near him who are hurt by his spirit of anger.

Wrath
Wrath on the other hand is the sudden outburst of anger. He explodes with anger. Modern English uses "blows up" to describe this far too common scene. This person's anger is directed toward others. Instead of long calculative acts of revenge, he takes it out right there on the spot. Horrible violence results.

Ps 32:3-4
"When I kept silent about my sin, my body wasted away Through my groaning all day long. For day and night Thy hand was heavy upon me; My vitality was drained away as with the fever heat of summer. Selah."

Internalized anger creates secret thoughts and plans of revenge. Many odd and inconsiderate behaviors occur when one is silently angry.

Increased guilt causes greater bursts of anger. Anger is often closely associated with sensual sins. Dreaded physical symptoms are also commonly present.

Proverbs 29:11
"A fool gives full vent to his anger: but the wise man holding it back quiets it."

Notice the two ways to deal with anger. A fool lets the anger control him. The wise man controls it. We need to share with people the wisdom of holding back the venting of our anger. One way we can do this is show them the foolish results of the way they handle anger. We must discourage people from venting ones anger into a pillow. Although that might be considered a form of control, the anger spirit can be better controlled and eliminated by God's grace.

Explosions of anger usually follow longer periods of silence where anger is hidden away.