摩訶止觀 6.118

6.118

或五法為藥，即是五根。修止觀時無疑名信根；常念止觀不念餘事即念根；止觀不息即精進根；一心在定即定根；四句體達無性故即慧根。五根增長，名為「五力」。

Or five dharmas are taken as medicine, which are the five faculties: when cultivating calming and contemplation, freedom from doubt is the faculty of faith; constantly keeping calming and contemplation in mind without thinking of other matters is the faculty of mindfulness; unceasing calming and contemplation is the faculty of vigor; focusing the mind in concentration is the faculty of samādhi; penetrating the four propositions as lacking intrinsic nature is the faculty of wisdom. When the five faculties increase, they are called the 'five powers'.