बुद्ध्या विशुद्धया युक्तो धृत्याऽऽत्मानं नियम्य च।
शब्दादीन् विषयांस्त्यक्त्वा रागद्वेषौ व्युदस्य च।।18.51।।
।।18.51।।जो विशुद्ध (सात्त्विकी) बुद्धिसे युक्त? वैराग्यके आश्रित? एकान्तका सेवन करनेवाला और नियमित भोजन करनेवाला साधक धैर्यपूर्वक इन्द्रियोंका नियमन करके? शरीरवाणीमनको वशमें करके? शब्दादि विषयोंका त्याग करके और रागद्वेषको छोड़कर निरन्तर ध्यानयोगके परायण हो जाता है? वह अहंकार? बल? दर्प? काम? क्रोध और परिग्रहका त्याग करके एवं निर्मम तथा शान्त होकर ब्रह्मप्राप्तिका पात्र हो जाता है।
Buddhi is spiritual intelligence the consciousness which exclusively focuses on the atma. Manas refers to the mind, senses and body which acting in such a way discourages desires for sense gratification and encourages reflection on the Supreme Lord. Vairagyam-samipasritah means renouncing the objects which the senses hanker for and indifference to mundane pursuits. It is while chasing such pursuits that occasionally friendship or enmity transpires so ceasing from these pursuits would free one from raga-dvesau attraction and repulsion. Vivikta-sevi is seeking solitude in remote places aloof from disturbances to meditation. Moderation in eating and sleeping. Dhyana- yoga means internally performing continuous bhakti or exclusive loving devotional service unto the Supreme Lord Krishna or any of His avatars or incarnations and expansions as authorised in Vedic scriptures. Gradually increasing aversion towards anything that is not connected to the atma or immortal soul and the Supreme Lord. Ahankaram is egoistic conceptions that considers the body to be all in all and cannot discern that they are not their physical body. Balam is lust for power, darpan is vain conceit which is derived from it and nirmanam is the notion one possesses what is not ones own. Santah is tranquillity peacefulness, the serenity of bliss acquired by constant reflection and meditation upon the Supreme Lord qualifies one to achieve realisation of the brahman or spiritual substratum pervading all existence and and achieving moksa or liberation from material existence attains atma tattva or soul realisation and enters into the bliss of communion with the Supreme Lord.