Premanand Maharaj Ji
Why should I avoid real anger even when I have to be strict?
Anger steals your judgment
Anger carries off the intellect, so you may say or do the wrong thing. Where it is needed you may act angry, but inwardly take shelter of Bhagwan and do bhajan.
In reality one should not be angry, because anger steals the intellect, which can then no longer decide correctly.