Charak Samhita
बलाबलविशेषोऽस्ति तयोरपि च कर्मणोः। दृष्टं हि त्रिविधं कर्म हीनं मध्यममुत्तमम् ॥३१॥
These two factors are gauged by means of various degrees of strength and weakness, which can be further classified into three kinds- inferior, medium, superior.
english translation
balAbalavizeSo'sti tayorapi ca karmaNoH। dRSTaM hi trividhaM karma hInaM madhyamamuttamam ॥31॥
hk transliteration by Sanscript