Shloka 20
Mind as Charioteer; Kṣetrajña, Tapas, and Dhyāna-Yoga
Adhyātma-Upadeśa
तथा कर्मसु विज्ञेयं फलं भवति वा न वा । पुरुषस्यात्मनि:श्रेय: शुभाशुभनिदर्शनम्
tathā karmasu vijñeyaṃ phalaṃ bhavati vā na vā | puruṣasyātmaniḥśreyaḥ śubhāśubhanidarśanam |
また行為の領域においては、果が生ずることもあれば、生じないこともあると知るべきである。人が自己の内において成就する最高の善は、前世より携えてきた吉凶の印象（サンスカーラ）を示す標となる。ゆえにヨーガの戒律と修行に入っても、成就は困難のうちにのみ現れることがあり、あるいはついに顕れぬことさえある—それら潜在の形成に従って。
वायुदेव उवाच
Educational Q&A
Results in action are not mechanically guaranteed; fruition may occur or may not. One’s inner progress toward niḥśreyas (highest good) reveals the force of prior auspicious and inauspicious saṃskāras, explaining why yogic attainment can be difficult or delayed for some.
Vāyudeva is instructing the listener on the moral psychology of karma and spiritual practice: he frames success in yogic discipline as conditioned by past-life impressions, and urges discernment that outcomes are contingent rather than assured.