PRAŚNA UPANISHAD · 5.3

स यद्येकमात्रमभिध्यायीत स तेनैव संवेदितस्तूर्णमेव
जगत्यामभिसम्पद्यते । तमृचो मनुष्यलोकमुपनयन्ते स तत्र
तपसा ब्रह्मचर्येण श्रद्धया सम्पन्नो महिमानमनुभवति ॥ ५.३॥

sa yadyekamātramabhidhyāyīta sa tenaiva saṃveditastūrṇameva
jagatyāmabhisampadyate । tamṛco manuṣyalokamupanayante sa tatra
tapasā brahmacaryeṇa śraddhayā sampanno mahimānamanubhavati ॥ 5.3॥

“If he meditate on the one letter of OM the syllable, by that enlightened he attaineth swiftly in the material universe, and the hymns of the Rigveda escort him to the world of men; there endowed with askesis and faith and holiness he experienceth majesty.

Sri Aurobindo · CWSA 18, p. 188