“Mendicants, there are these five faculties. What five? The faculties of faith, energy, mindfulness, immersion, and wisdom. These are the five faculties. Someone who has completed and fulfilled these five faculties is a perfected one. If they are weaker than that, they’re one who is extinguished between one life and the next … one who is extinguished upon landing … one who is extinguished without extra effort … one who is extinguished with extra effort … one who heads upstream, going to the Akaniṭṭha realm … a once-returner … a stream-enterer … a follower of teachings … a follower by faith. So from a disparity of faculties there’s a disparity of fruits. And from a disparity of fruits there’s a disparity of individuals.”

Linked Discourses 48.17 2. Weaker In Detail (3rd)

“Mendicants, there are these five faculties. What five? The faculties of faith, energy, mindfulness, immersion, and wisdom. These are the five faculties. Someone who has completed and fulfilled these five faculties is a perfected one. If they are weaker than that, they’re one who is extinguished between one life and the next … one who is extinguished upon landing … one who is extinguished without extra effort … one who is extinguished with extra effort … one who heads upstream, going to the Akaniṭṭha realm … a once-returner … a stream-enterer … a follower of teachings … a follower by faith. So, mendicants, if you practice fully you succeed fully. If you practice partially you succeed partially. But in any case, these five faculties are not barren, I say.”

Linked Discourses 48.18 2. Weaker Practicing