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Amir al -Mu’minin said:
All asceticism is between the two sentences from the Qur’an. God Almighty says, “Do not grieve for what you miss and do not happiness.” Anyone who has not regretted the past and is not happy about the future has taken the asceticism from both sides.
Nahj al -Balagha Wisdom
islamquotes.org
NOTE: Translated with Google Translate