Shloka 40
Brahmacarya-Upāya: Jñāna, Śauca, and the Mind’s Role in Desire (शान्ति पर्व, अध्याय २०७)
द्वापरे मैथुनो धर्म: प्रजानामभवन्नूप । तथा कलियुगे राजन द्वन्ड्यमापेदिरे जना:,नरेश्वर! द्वापरयुगमें प्रजाके मनमें मैथुनधर्मका सूत्रपात हुआ। राजन! उसी तरह कलियुगमें भी लोग मैथुनधर्मको प्राप्त होने लगे
dvāpare maithuno dharmaḥ prajānām abhavan nṛpa | tathā kaliyuge rājan dvandyam āpedire janāḥ ||
ビーシュマは言った。「王よ、ドヴァーパラの世には、人々のうちに交合（マイトゥナ）への衝動が起こり、支配的な傾向となった。同じく、ラージャンよ、カリの世には人々が二対（ドヴァンドヴァ）—相反する一対—に囚われ、引かれ押し戻されて、行いはますます争いと、惹かれと、嫌悪とに駆られるようになった。」
भीष्म उवाच
Educational Q&A
Bhīṣma outlines a yuga-based ethical psychology: in Dvāpara, society becomes increasingly oriented toward maithuna (sexual union as a dominant impulse), while in Kali people are overtaken by dvandva—inner and outer conflicts born of opposites—leading to instability in conduct and judgment.
In Śānti Parva, Bhīṣma instructs the king on dharma and the changing character of ages (yugas). Here he contrasts Dvāpara and Kali, describing how prevailing human tendencies shift and how these shifts affect social and moral life.