Prahlāda–Indra Saṃvāda: Kartṛtva (Agency) and Svabhāva (Nature) in the Causation of Karma
ताभि: संयुक्तमनसो ब्रह्म तत् सम्प्रकाशते । शनैश्वोपगते सच्चे ब्रह्मभूयाय कल्पते,उन इन्द्रिययेवताओंसे जिसका मन संयुक्त हो गया है, उसके अन्तःकरणमें परब्रह्म परमात्मा प्रकाशित हो उठता है; फिर धीरे-धीरे सत्त्वगुण प्राप्त होनेपर वह मनुष्य ब्रह्मभावको प्राप्त हो जाता है
tābhiḥ saṃyuktamanaso brahma tat samprakāśate | śanaiśvopagate sattve brahmabhūyāya kalpate ||
Bhishma said: When a person’s mind becomes harmonized with those presiding powers of the senses, the Supreme Brahman shines forth clearly within the inner being. Then, as purity (sattva) gradually arises, that person becomes fit to attain the state of Brahman—freedom from delusion and steady establishment in the highest reality.
भीष्म उवाच
Inner realization of Brahman arises when the mind is properly integrated with and governed through the senses (and their presiding principles), leading to increasing sattva (purity/clarity). As sattva grows gradually, one becomes qualified for brahma-bhāva—abidance in the highest reality.
In the Shanti Parva’s instruction on peace and liberation, Bhishma continues advising Yudhishthira on the inner disciplines that lead beyond sorrow. Here he describes a contemplative progression: disciplined sensory life and mental integration give rise to inner illumination, and sustained purity culminates in fitness for Brahman-realization.