Of course it is bewildering, O soul of the universe, that You work, though You are inactive, and that You take birth, though You are the vital force and the unborn. You Yourself descend amongst animals, men, sages and aquatics. Verily, this is bewildering.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
जन्म कर्म च विश्वात्मन्नजस्याकर्तुरात्मनः । तिर्यङ्नृर्षिषु यादःसु तदत्यन्तविडम्बनम्
janma karma ca viśvātmannajasyākarturātmanaḥ | tiryaṅnṛrṣiṣu yādaḥsu tadatyantaviḍambanam
SB 1.8.30