Bhagavad Gita · Chapter 11: The Vision of the Cosmic Form
Bhagavad Gita 11.52
सुदुर्दर्शमिदं रूपं दृष्टवानसि यन्मम ।
देवा अप्यस्य रूपस्य नित्यं दर्शनकाङ्क्षिणः ॥
sudurdarśamidaṃ rūpaṃ dṛṣṭavānasi yanmama | devā apyasya rūpasya nityaṃ darśanakāṅkṣiṇaḥ ||
This form of mine that you have seen is very hard to see. Even the gods are always longing for a sight of it.
Modern context
Even the gods long to see what Arjuna has seen. Krishna wants him to understand how rare the gift was. Often we do not realise the value of what we have received until someone points it out. A good teacher helps a student see not only the lesson but how precious the opportunity was.