Gītārtha Saṃgraha verse 3

madhyame bhagavattattva yāthātmyāvāpti siddhaye |
jñāna karmābhinirvartyo bhaktiyogaḥ prakārtitaḥ ||

tattva - principle; thatnesssiddhi - accomplishmentjñāna - knowing; knowledge; higher knowledgekarman - actionbhakti - devotion

Commentaries and Reflections

TKV Desikachar:

Devotion is the basis for seeing the truth.
This truth is, the Lord.
But devotion must grow from following ones duty
in a spirit of selflessness and search.”

Paul Harvey:

Overview to the Gītārtha Saṃgraha of Yāmunācārya