One shall always stay faithful to Dharma, as Dharma is the deliverer of all required wealth and happiness. There is nothing unachievable if one is faithful to Dharma. Therefore one should never act unrighteously, contrary to Dharmic law even if such act will derive great benefits and prosperity. One should always stay true to Dharma. Even in unfavourable times, one should never renounce their Dharma.
This again is as per the teachings of Parashar. Dharma as detailed in this Shikshapatri and other Dharma Shastras and is the only worthy science of behaviour. It is the only source of a fruitful life. Smruti explains: ‘Dharma is the only deliverer of basic or worldly (Aihik) and greater (Parlaukik) happiness.’ Consequently, Dharmabhrashto Vinashyati - ‘Those that live contrary to Dharma face destruction.’