Yoga Sūtra Chapter Two verse 44

स्वाध्यायादिष्टदेवता संप्रयोगः ॥४४॥

svādhyāyāt-iṣṭa-devatā-saṃprayogaḥ ||44||

From self-study,
total joining together with chosen deity.

svādhyāya - to study; to read; sacred recitation; study of the selfiṣṭa - chosendevatā - divinitysaṃprayoga - total joining together