Yet we are moved to wonder about the existence of someone more powerful than you when we think of your great austerities in perfect discipline, although your good self is so powerful in the matter of creation.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स भवानचरद्घोरं यत्तपः सुसमाहितः । तेन खेदयसे नस्त्वं पराशङ्कां प्रयच्छसि
sa bhavānacaradghoraṃ yattapaḥ susamāhitaḥ | tena khedayase nastvaṃ parāśaṅkāṃ prayacchasi
SB 2.5.7