Bhagavad Gita · Jnana Karma Sannyasa YogaChapter 4, Shloka 34 (4.34)

Three keys to learning.

1. Praṇipāta — Shankaracharya: prakarṣeṇa nīcaiḥ patanaṃ praṇipātaḥ dīrgha-namaskāraḥ — a full prostration; the attitude — humility, setting ego aside.
2. Paripraśna — Shankaracharya: kathaṃ bandhaḥ, kathaṃ mokṣaḥ, kā vidyā kā cāvidyā — "How does bondage come about? How does liberation? What is knowledge, what is ignorance?" — deep, sincere questions like these.
3. Sevā — guru-śuśrūṣā — service to the guru.

"Jñāninas tattva-darśinaḥ" — why two descriptions? Shankaracharya: jñānavanto 'pi kecit yathāvat tattva-darśana-śīlāḥ apare na — among those with knowledge, only some truly see the truth as it is, not all; ye samyag-darśinaḥ tair upadiṣṭaṃ jñānaṃ kārya-kṣamaṃ bhavati netarat — only knowledge taught by those of right vision is effective, not that of others.

Acharya Ramanuja: tad ātma-viṣayaṃ jñānam — that knowledge of the self which I explained from 2.17 to 2.39; mad-ukta-karmaṇi vartamānaḥ tvaṃ vipākānuguṇaṃ kāle — while you continue in the action I have taught, at the proper time, when you are ripe, praṇipāta-paripraśna-sevābhiḥ viśadākāraṃ jñānibhyo viddhi — learn it clearly from the wise through these. Sākṣāt-kṛtātma-svarūpāḥ tu jñāninaḥ … tava āśayam ālakṣya — the wise who have directly realised the self, seeing your intent, will teach you.