The "Linked Discourses on the Faculties" explores the five spiritual faculties: faith, energy, mindfulness, collectedness, and wisdom. These teachings examine how these faculties function as both the means to attain liberation and as qualities that become increasingly refined through practice. By developing these faculties in a balanced way, practitioners can progress on the path to awakening.
Indriyasaṁyutta - Linked Discourses on the Faculties
The Buddha explains the five faculties of faith, energy, mindfulness, collectedness, and wisdom.
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.
The Buddha explains how a trainee and an arahant understand their respective attainments.