मय्येव मन आधत्स्व मयि बुद्धिं निवेशय।निवसिष्यसि मय्येव अत ऊर्ध्वं न संशयः॥
mayy eva mana ādhatsva mayi buddhiṃ niveśayanivasiṣyasi mayy eva ata ūrdhvaṃ na sanśayaḥ
Word by word
The verse says
Place your mind in me alone, let your reason rest in me. From then on you will live in me. Of this there is no doubt.
In plain words
The direct instruction, given once, plainly.
Mind and reason, both. Not feeling instead of thought — both of them, in the same place.
And then the promise, in the future tense: you will live there. Not visit.
Where you've felt this · in creative work
A musician who has played the same instrument since childhood does not think about where her hands go. She thinks about the piece. The hands were a problem for about four years and then stopped being one, and she could not tell you the week it happened.
Going deeper
This is the whole teaching in one line, and the next three verses exist because almost nobody can do it.
It is worth reading on its own first. Mind and reason both placed in one direction, and then a life lived from there. No method is given because none is needed; this is what it looks like when it has already happened.
What follows is the chapter's real generosity. Having stated the thing plainly, Krishna immediately assumes you cannot do it, and keeps lowering the bar until it reaches somewhere you can step over.
That sequence is rare in religious writing, which tends to state the ideal and leave the reader to feel the gap. Here the gap is the subject of the next three verses.