Jyotisha for adhidaivik (Manas-Buddhi-Ahamkāra)
Yoga for adhyātmik (Chaitanya PuruSha)
Three children of Sānkhya darshan to deliver from these trividha tāpa and knowing oneself.
A sādhaka must have at least a working knowledge of these three.
When they descend down to more jaDa level, they manifest themselves as Kapha-pitta-vāta of Indriya and body.
Balance is the key.
Hence Shruti proclaims shri vishNu as “इंद्रस्य युज्यं सखा” (one who is almost an inseparable and linked “friend/cohabitor” of Indra [real seer : drashTā - puruSha])
Step two - he pervaded adhidaivik
Step three - he becomes “इंद्रस्य युज्यं सखा” and pervades even the adhyātmik
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Why did he do it? अतो धर्माणि धारयन (To uphold dharma and the lokas we dwell in). Hence we owe deva-RNa (देवऋण) to shri vishNu