Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 37
Sanskrit:
क्वचिद् रजांसि विममे पार्थिवान्युरुजन्मभि: ।गुणकर्माभिधानानि न मे जन्मानि कर्हिचित् ॥ ३७ ॥
ITRANS:
kvacid rajāṁsi vimamepārthivāny uru-janmabhiḥguṇa-karmābhidhānānina me janmāni karhicit
Translation:
After many lifetimes someone might count the dust particles on the earth, but no one can ever finish counting My qualities, activities, names and births.