Bhagavad Gita · 7.3

मनुष्याणां सहस्रेषु कश्चिद्यतति सिद्धये।यततामपि सिद्धानां कश्चिन्मां वेत्ति तत्त्वतः॥

manuṣhyāṇāṁ sahasreṣhu kaśhchid yatati siddhaye yatatām api siddhānāṁ kaśhchin māṁ vetti tattvataḥ

Among thousands of people, hardly one strives for perfection; and among those who strive and succeed, hardly one knows Me in truth.

— Bhagavad Gita 7.3

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)