Peace of mind is one of the greatest pleasures a person can have. Conversely, lack of peace of mind can make one's life constant torture.
A person who has mastered peace of mind has gained everything. To obtain peace of mind, you need to be at peace with your emotions and desires. And you need to be at peace with your Creator."
Love Yehuda Lave
On Not Obeying Immoral Orders (Shemot, Covenant & Conversation 5775 on Ethics)