Mahabharata 12.271.12
तद्वज्जातिशतैर्जीवः शुध्यतेऽल्पेन कर्मणायत्नेन महता चैवाप्येकजातौ विशुध्यते
tadvajjātiśatairjīvaḥ śudhyate'lpena karmaṇāyatnena mahatā caivāpyekajātau viśudhyate
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book