If you really want peace of mind and inner calm, you will get it. Regardless of how unjustly you have been treated, or how unfair the boss has been, or what a mean scoundrel someone has proved to be, all this makes no difference to you when you awaken to your mental and spiritual powers.
Think Yourself to Health, Wealth & Happiness: The Best of Dr. Joseph Murphy's Cosmic Wisdom (ed. Penguin, 2002) - ISBN: 9781101665435