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Imam Ali (P.B.U.H) says:

Do not engage your heart with grief for the past because you will lose readiness for the future.

brief description:
a few people could be found without any mistake and not-losing some opportunities in their life.
herein, there are two groups of people. some of them waste their time through regretting for the past and lose their remaining energies in this way. but some others assume the past as finished and forget it and only take some lessons from them for organizing the future and use all of their powers and forces for constructing today and tomorrow. surely, they will become victorious as Imam Ali (a.s.) has mentioned in the above tradition.

Narrated from Ghorar-ul-hekam, page 289

قال امیرالمومنین، علی ابن ابی طالب علیه السلام

لاتُشْغِلْ قَلْبَكَ الْهَمَّ عَلَى مافاتَ فَيُشْغِلَكَ عَنِ الاْسْتِعْدادِ بِما هُوَ آت

قلبت را با غم و اندوه گذشته درگیر نکن ، چرا که از آمادگی برای آینده باز می مانی

غررالحکم صفحه298