18.37 Yat, that joy which is; iva, like; visam, poison, a source of pain; agre, in the beginning-when it first comes in the early stages of (acisition) of knowledge, detachment, meditation and absorption, since they involve great struggle; but amrtopamam, comparable to nectar; pariname, in the end, when it arises from the maturity of knowledge, detachment, etc.; and which atma-buddhi-prasadajam, arises from the purity (prasada), trasparence like water, of one's intellect (atma-buddhi); tat, that; sukham, joy; is proktam, spoken of, by the learned ones ;as sattvikam, born of sattva. Or, the phrase atma-buddhi-prasadajam may mean 'arising from the high degree of clearness of that atma-buddhi (knowledge of or connected with the Self)'; therefore it is born of sattva.