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 - wished, desired; liked, beloved; chosendevatā - image of a deity; idol; godhead, divinitysaṃprayoga - total joining together