Bhagavad Gita, Chapter 18, Verse 50

सिद्धिं प्राप्तो यथा ब्रह्म तथाप्नोति निबोध मे । समासेनैव कौन्तेय निष्ठा ज्ञानस्य या परा

siddhiṃ prāpto yathā brahma tathāpnoti nibodha me | samāsenaiva kaunteya niṣṭhā jñānasya yā parā

Translation

How he who has attained perfection reaches Brahman, that in brief do thou learn from Me, O son of Kuntī — that supreme consummation of knowledge.

— Alladi Mahadeva Sastri

Word meanings

siddhim
perfection
prāptaḥ
attained
yathā
as
brahma
Brahman
tathā
so
āpnoti
obtains
nibodha
learn
me
of me
samāsena
by summary
eva
even
kaunteya
O Kaunteya
niṣṭhā
state
jñānasya
of wisdom
which
parā
highest

Śaṅkarācārya's commentary

The perfection he has already attained consists in the body and the senses being prepared for devotion to knowledge, as a result of the Grace of the Lord worshipped through his duty. Consummation (niṣṭha) means perfection, the final or highest stage. The supreme consummation is of Brahma-jñāna, of the same nature as Self-knowledge, of the nature described by the Lord and in the passages of the Upaniṣads.