CC Madhya 25.103
āmā pāite sādhana-bhakti ‘abhidheya’-nāma
“[Lord Kṛṣṇa says:] ‘I am the center of all relationships. Knowledge of Me and the practical application of that knowledge is actual knowledge. Approaching Me for devotional service is called abhidheya.
Spiritual knowledge means fully understanding the Absolute Truth in three features — impersonal Brahman, localized Paramātmā and the all-powerful Supreme Personality of Godhead. Ultimately when one takes shelter at the lotus feet of the Supreme Personality of Godhead and engages in the Lord’s service, the resultant knowledge is called vijñāna, special knowledge, or the practical application of spiritual knowledge. One should be engaged in the Lord’s devotional service to achieve the aim of life, called prayojana. The practice of devotional service to attain that goal of life is called abhidheya.