Highlights from Nampil̤l̤ai's Vyākhyānam as documented by Vadakkuth Thiruvīdhip Pil̤l̤ai:
kuṛikkoḷ gyānangaḷāl - A special kind of knowledge (gyāna viśeṣam - bhakti) which is acquired by practicing Aṣṭāṅga Yoga (yama, niyama, āsana, prāṇāyāma, pratyāhāra, dhāraṇa, dhyāna, samādhi). Such knowledge/devotion is indicated by vedhana, dhyāna, upāsana, etc.
**enai