BG 5.17

5.17 तद्बुद्धयः intellect absorbed in That? तदात्मानः their self being That? तन्निष्ठाः established in That? तत्परायणाः with That for their supreme goal? गच्छन्ति go? अपुनरावृत्तिम् not again returning? ज्ञाननिर्धूतकल्मषाः,those whose sins have been dispelled by knowledge.Commentary They fix their intellects on Brahman or the Supreme Self. They feel and realise that Brahman is their self. By constant and protracted meditation? they get established in Brahman. The whole world of names and forms vanishes for them. They live in Brahman alone. They have Brahman alone as their supreme goal or sole refuge. They rejoice in the Self alone. They are satisfied in the Self alone. They are contented in the Self alone. Such men never come back to this Samsara? as their sins are dispelled by knowledge (BrahmaJnana). (Cf.IX.34)

— vedicscriptures · exposition · source ↗

The Supreme Transcendental Truth is Lord Kṛṣṇa. The whole Bhagavad-gītā centers around the declaration that Kṛṣṇa is the Supreme Personality of Godhead. That is the version of all Vedic literature. Para-tattva means the Supreme Reality, who is understood by the knowers of the Supreme as Brahman, Paramātmā and Bhagavān. Bhagavān, or the Supreme Personality of Godhead, is the last word in the Absolute. There is nothing more than that. The Lord says, mattaḥ parataraṁ nānyat kiñcid asti dhanañ-jaya. Impersonal Brahman is also supported by Kṛṣṇa: brahmaṇo hi pratiṣṭhāham. Therefore in all ways Kṛṣṇa is the Supreme Reality. One whose mind, intelligence, faith and refuge are always in Kṛṣṇa, or, in other words, one who is fully in Kṛṣṇa consciousness, is undoubtedly washed clean of all misgivings and is in perfect knowledge in everything concerning transcendence. A Kṛṣṇa conscious person can thoroughly understand that there is duality (simultaneous identity and individuality) in Kṛṣṇa, and, equipped with such transcendental knowledge, one can make steady progress on the path of liberation.

— vedicscriptures · exposition · source ↗