One who has developed the five faculties is an Arahant. Those who are lesser in the development of these faculties are practicing for the realization of the fruit of Arahantship.
Paṭipanna sutta - Practicing
"Bhikkhus, these are the five faculties. Which five? The faculty of confidence, persistence, mindfulness, collectedness and wisdom.
Among these, bhikkhus, when the five faculties are fully developed, one is an Arahant. Those who are lesser in the development of these faculties are practicing for the realization of the fruit of Arahantship. Those milder still are non-returners; those even milder are practicing for the fruit of non-returning. Those milder still are once-returners; those even milder are practicing for the fruit of once-returning. Those milder still are stream-enterers; those even milder are practicing for the fruit of stream-entry.
If anyone, bhikkhus, is completely devoid of these five faculties, I declare that such a person stands outside, in the faction of the ordinary person."