Neurologists claim that every time you resist acting on your anger, you’re actually rewiring your brain to be calmer and more loving.
Now look at this hadith from that perspective:
A man said to the Prophet (salallahu alayhi wa sallam) , ‘Give me advice.’ The Prophet (saw) said, ‘Do not get angry.’ The man asked repeatedly and the Prophet answered each time, ‘Do not get angry.’ (Sahih al-Bukhari)
