Vidura uvācha, “One who does heavenly karma with the wealth accumulated through adharma will not obtain the fruits of that after his demise; because his wealth has come from bad ways.
Those with substance/essence that is men endowed with willpower will not fear a dense forest, unapproachable path, time of tough/untoward difficulty and to take a weapon to strike in the time of trepidation/nervousness.
These are considered to be the main advice for advancement – trade/business, temperance, proficiency, caution, resoluteness, recollection and thinking exhaustively before commencing a work.
The strength of tapasvis (ascetics) is tapah (austerity and penance), the strength of those well-versed in the Vedas/scholars is Vedas, the strength of sinners is violence and the strength of virtuous ones is forgiveness.
These eight are not destroyers of vrat (fast) – water, roots, fruits, milk, ghee, fulfilling the desires/needs of Brahman, obeying the words of Guru and medicine.
[Prajāgara Parva – Vidura Nīti – Conversation between Dhrutharashtra and Vidura – Chapter 39 of Udyoga Parva – Slokas 66 – 70]