Bhagavad Gita, Chapter 12, Verse 8

मय्येव मन आधत्स्व मयि बुद्धिं निवेशय । निवसिष्यसि मय्येव अत ऊर्ध्वं न संशयः

mayyeva mana ādhatsva mayi buddhiṃ niveśaya | nivasiṣyasi mayyeva ata ūrdhvaṃ na saṃśayaḥ

Translation

Fix thy mind in Me exclusively; apply thy reason to Me. Thou shalt no doubt live in Me alone hereafter.

— Alladi Mahadeva Sastri

Word meanings

mayi
in me
eva
even
manaḥ
the mind
ādhatsva
place
mayi
in me
buddhim
the reason
niveśaya
cause to enter
nivasiṣyasi
(thou) shalt dwell
mayi
in me
eva
even
ataḥ
hence
ūrdhvam
above (afterwards)
na
not
saṃśayaḥ
doubt

Śaṅkarācārya's commentary

Fix thy mind (manas) — thy purposes and thoughts — in Me, the Lord in the Universal Form. Fix in Me thy reason (buddhi) also which resolves and determines. The result is this: Thou shalt without fail abide in Me as Myself, on the death of this body. Thou shalt not doubt it.