What I found interesting about the verse above is that it does not say that we will never get angry but warns us to not commit a sin as a result of it. This became the case for King Saul when his anger was sparked against David and turned into a consuming fire in 1 Samuel 18:7-12. Anger, as most psychologists have come to understand it, not only affects the mind but also affects the body as well by causing an increase in one's heart rate, blood pressure and levels of hormones such as adrenaline. Basically, in the long run, anger can affect our overall health and well-being. Hence God's warning about not carrying our wrath into the next day.
This study really prompted me to examine how I deal with anger and the Holy Spirit showed me that my anger is sparked mostly by a desire to please those around me instead of only focusing on pleasing God (Galatians 1:10). So no matter what may cause your anger, make sure to take it to the Lord in prayer and not let it become a consuming fire.