Bhagavad Gita 11.48

11.48 Neither by the study of the Vedas and sacrifices, nor by gifts nor by rituals nor by severe austerities can I be seen in this form in the world of men by any other than thyself, O great hero of the Kurus (Arjuna).

O best of the Kuru warriors, no one before you has ever seen this universal form of Mine, for neither by studying the Vedas, nor by performing sacrifices, nor by charity, nor by pious activities, nor by severe penances can I be seen in this form in the material world.