What is the rationale to work on the mildest anger first? In order to do anything well, it is important to execute the task in proper sequence. Generally, that is to do the easy part first followed by the more difficult. When the mildest anger is overcome, one naturally gains the confidence to go on. As one becomes more stable and stronger in one’s practice over time, it will be much easier to deal with more violent afflictions. Conversely, if one tries to work with rage and fury at the start, one may fail miserably, be utterly disheartened and never want to practice again.

~Depicted from THE HANDBOOK'S FOR LIFE JOURNEY - On The Three Poisons-How to Confront Anger