Yoga-kṛtya (योककृत्य) — Vyāsa on Sense-Restraint, Obstacles, and Brahman-Realization
त्रेतायां संहता वेदा यज्ञा वर्णाश्रमास्तथा । संरोधादायुषस्त्वेते भ्रश्यन्ते द्वापरे युगे
tretāyāṃ saṃhatā vedā yajñā varṇāśramās tathā | saṃrodhād āyuṣas tv ete bhraśyante dvāpare yuge ||
ବ୍ୟାସ କହିଲେ—ତ୍ରେତାଯୁଗରେ ବେଦଗୁଡ଼ିକ ଅଖଣ୍ଡ ଓ ସଂହତ ରୂପରେ ଥିଲା; ଯଜ୍ଞ ଏବଂ ବର୍ଣ୍ଣାଶ୍ରମ-ଧର୍ମ ମଧ୍ୟ ସୁସଂଗଠିତ ଭାବେ ପାଳିତ ହୁଅଥିଲା। କିନ୍ତୁ ଦ୍ୱାପରଯୁଗରେ ଆୟୁ ସଂକୁଚିତ ହେବାରୁ ଏସବୁ କ୍ଷୟ ପାଇଲା—ଲୋକେ କ୍ରମେ ବେଦ, ଯଜ୍ଞ ଓ ବର୍ଣ୍ଣାଶ୍ରମ କର୍ତ୍ତବ୍ୟରୁ ଚ୍ୟୁତ ହେଲେ।
व्यास उवाच
As the yugas progress, human capacity—especially lifespan and steadiness—diminishes, and with it the ability to preserve Vedic learning, sacrificial discipline, and varṇāśrama duties; dharma declines not merely by doctrine but by weakened human endurance and commitment.
Vyāsa is explaining a yuga-based account of social and religious change: in Tretā, Vedic and ritual order is stable and well-observed; by Dvāpara, due to curtailed lifespan, people lose vigor for sustained observance, and established institutions begin to erode.