In plain words
Veiled by My Yoga-māyā, I am not manifest to everyone. This deluded world does not know Me as unborn and imperishable.
Word for word
I [am] not manifest to everyone, veiled by yogamāyā; this deluded world does not know Me, unborn, imperishable.
नाहं प्रकाशः सर्वस्य योगमायासमावृतःमूढोऽयं नाभिजानाति लोको मामजमव्ययम्
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam
तदज्ञानं किंनिमित्तमित्युच्यते —
न अहं प्रकाशः सर्वस्य लोकस्य, केषाञ्चिदेव मद्भक्तानां प्रकाशः अहमित्यभिप्रायः । योगमायासमावृतः योगः गुणानां युक्तिः घटनं सैव माया योगमाया, तया योगमायया समावृतः, सञ्छन्नः इत्यर्थः । अत एव मूढो लोकः अयं न अभिजानाति माम् अजम् अव्ययम् ॥
यया योगमायया समावृतं मां लोकः नाभिजानाति, नासौ योगमाया मदीया सती मम ईश्वरस्य मायाविनो ज्ञानं प्रतिबध्नाति, यथा अन्यस्यापि मायाविनः मायाज्ञानं तद्वत् ॥ २५ ॥
In plain words
But what actually causes that failure to recognize you? Here is the answer —
I am not on open display to everyone. Only to a few — to my devotees — am I visible. That is the point being made. And 'veiled by yogamāyā': yoga here means the joining, the fitting-together, of the guṇas; that joining is itself māyā, and so the single word yogamāyā. Wrapped in that yogamāyā, screened by it — that is what the word says. And exactly because of this, this bewildered world does not recognize me: unborn, undecaying.
Because of this power of divine concealment, this yogamāyā, the world simply doesn't recognize me for what I am. But understand something important: this power is entirely my own — I am the Lord, the master of this māyā, not its victim. What it obstructs is other people's knowledge of me, never my own knowledge of myself. It works the same way an ordinary magician's trick does: the illusion blocks the audience's understanding of what's really happening, but it never once touches the magician's own clear awareness of the trick. That's exactly how it is with me.
Close to the Sanskrit
That non-recognition — due to what cause? — it is said in answer —
I am not manifest to the whole world; to some only, to my devotees, am I manifest — such is the purport. 'Veiled by yogamāyā': yoga is the joining, the fitting-together, of the guṇas; that very thing is māyā, hence yogamāyā; veiled by that yogamāyā, that is, concealed — such is the meaning. Precisely for this reason this deluded world does not recognize me, the unborn, the imperishable.
By which yogamāyā, veiled, [that is,] me, the world does not fully recognize. This yogamāyā is not [an obstruction to] my own [knowledge], being mine, of me, the Lord, the possessor of māyā; [rather, it] obstructs [the] knowledge [of others]; just as, even of another, of a possessor of illusion, the knowledge of the illusion [is obstructed only in the observer], in the same way.