Bhagavad Gita 11.52
Lord Shri Krishna replied: It is difficult to see the vision of Me that thou hast seen. Even the most powerful have longed for it in vain.
श्री भगवानुवाच
सुदुर्दर्शमिदं रूपं दृष्टवानसि यन्मम।
देवा अप्यस्य रूपस्य नित्यं दर्शनकाङ्क्षिणः॥śrī bhagavānuvāca
sudurdarśamidaṃ rūpaṃ dṛṣṭavānasi yanmama|
devā apyasya rūpasya nityaṃ darśanakāṅkṣiṇaḥ||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).