Gita Explained
कृष्ण कहते हैं4.39

श्रद्धावाँल्लभते ज्ञानं तत्परः संयतेन्द्रियः।ज्ञानं लब्ध्वा परां शान्तिमचिरेणाधिगच्छति॥

śraddhāvān labhate jñānaṃ tat-paraḥ sanyatendriyaḥjñānaṃ labdhvā parāṃ śāntim acireṇādhigacchati

शब्दार्थ
śraddhā-vāna faithful personlabhateachievesjñānamdivine knowledgetat-paraḥdevoted (to that)sanyatacontrolledindriyaḥsensesjñānamtranscendental knowledgelabdhvāhaving achievedparāmsupremeśāntimpeaceacireṇawithout delayadhigacchatiattains

व्याख्या अभी अंग्रेज़ी में उपलब्ध है। हिन्दी व्याख्या एक-एक अध्याय करके जोड़ी जा रही है।

श्लोक कहता है

The one who trusts it gets it — devoted to it, with the senses in hand. Having got it, he comes very soon to the deepest peace.

सरल शब्दों में

Three conditions, and then a promise that is suddenly fast.

Śraddhāvān — trusting. Tat-paraḥ — with that as the highest thing. Saṁyata-indriyaḥ — senses gathered.

And then acireṇa — without delay. After the in time of the verse before, this is quick.

आपने इसे कहाँ महसूस किया है

Months of training with nothing showing. Then in one session it arrives, and afterwards you cannot get back to not having it.

और गहराई में

The apparent contradiction with verse 38 is worth looking at rather than smoothing.

There: kālena, in due course. Here: acireṇa, without delay. Both in consecutive verses.

The resolution most readings reach is that the two clauses describe different stages. Coming to the point where knowledge is available takes time. What happens after it arrives is fast.

Which matches how most learning actually goes. Long flat stretches, then a step change that feels instantaneous and was not.

Śraddhāvān returns from 3.31, and it is again the first condition rather than the last. The Gita keeps putting trust before understanding, which offends a certain kind of reader and describes how anyone has ever learned anything difficult.

Parāṁ śāntim — the highest peace. This is the first time the chapter names the outcome, and it is not power or knowledge. It is quiet.