Bhagavad Gita Chapter 7.3
manuṣyāṇāḿ sahasreṣu
kaścid yatati siddhaye
yatatām api siddhānāḿ
kaścin māḿ vetti tattvataḥ
Translation
Out of many thousands among men, one may endeavor for perfection, and of those who have achieved perfection, hardly one knows Me in truth.