Bhagavatapurana 3.16.14

3.16.14

satīṃ vyādāya śṛṇvanto laghvīṃ gurv-artha-gahvarām /
vigāhyāgādha-gambhīrāṃ na vidus tac-cikīrṣitam //

14. With their ears wide open, they listened to the excellent speech, short yet hard to comprehend from its high purposes, not of shallow purport, but of inexhaustible significance, but even after careful enquiry they did not understand His purpose.