The Lord’s glorious acts and His acceptance of various transcendental forms for the performance of extraordinary pastimes in the mortal world are very difficult for anyone other than His devotees to understand, and for the beasts they are simply a mental disturbance.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
देहन्यासं च तस्यैवं धीराणां धैर्यवर्धनम् । अन्येषां दुष्करतरं पशूनां विक्लवात्मनाम्
dehanyāsaṃ ca tasyaivaṃ dhīrāṇāṃ dhairyavardhanam | anyeṣāṃ duṣkarataraṃ paśūnāṃ viklavātmanām
SB 3.4.34