Bhagavad Gītā Chapter Eight verse 8

abhyāsayogayuktena cetasā nānyagāminā |
paramaṃ puruṣaṃ divyaṃ yāti pārthānucintayan ||

abhyāsa - practice; the effort of the mind to remain in its unmodified condition of purity ; repeated or permanent exercise, discipline, use, habit, custom;anya - different from, other thanparama - highest, mostpuruṣa - animating principle, self, consciousness, spirit; a person, man, a human being; people

Commentaries and Reflections

Commentary by T Krishnamacharya:

araṃbanaṃ saṃśilanaṃ punaḥ punaḥ |
“Begin then verify, again begin then verify, again begin then verify.”