Question


Universal mantra of all mantras for attaining the highest level of God realization?

Answer


I upvoted SwamiVishwananda's answer, but not 100% convinced. is more of a sound vibration than a mantra.
Hence, I would extend it to below 2 mantras from Bhagavad Gita:

1. Gayatri Mantra

ॐ भूर्भुवः॒ स्वः ।
तत्स॑वि॒तुर्वरे॑ण्यं॒
भर्गो॑ दे॒वस्य॑ धीमहि ।
धियो॒ यो नः॑ प्रचो॒दया॑त् ॥

Meaning: We meditate on the glory of that being who has produced this universe; May he enlighten our minds. (as translated by Swami Vivekananda)

This mantra is the form of God itself.

BG 10.35

Of the hymns in the Sāma Veda I am the Bṛhat-sāma, and of poetry I am the Gāyatrī. Of months I am Mārgaśīrṣa [November-December], and of seasons I am flower-bearing spring.

2. Aum Tat Sat

ॐ तत् सत् 

Meaning: There is only 1 lord and truth.
Some people suggest that Hari Aum Tat Sat is the version for Kaliyuga.

According to Krishna, this mantra existed from the very origination.

BG 17.23

From the beginning of creation, the three words oṁ tat sat were used to indicate the Supreme Absolute Truth. These three symbolic representations were used by brāhmaṇas while chanting the hymns of the Vedas and during sacrifices for the satisfaction of the Supreme.


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