The Buddha explains the five faculties of faith, energy, mindfulness, collectedness, and wisdom.
Dutiyavibhaṅga sutta - Analysis of Five Faculties (Second)
"Bhikkhus, these are the five faculties. Which five? The faculty of faith, energy, mindfulness, collectedness and wisdom.
And what, bhikkhus, is the faculty of faith? Here, bhikkhus, a disciple of the noble ones has confidence, is convinced in the enlightenment of the Tathāgata, acknowledging: 'Indeed, the Blessed One is an Arahant and perfectly awakened, accomplished in true knowledge and conduct, well-gone, knower of the world, an unsurpassed guide for trainable individuals, a teacher of gods and humans, awakened, blessed.' This is called the faculty of faith.
And what, bhikkhus, is the faculty of energy? Here, bhikkhus, a disciple of the noble ones keeps his persistence aroused for the giving up of unwholesome mental qualities and for the cultivation of wholesome mental qualities. With steadfast determination and unwavering effort, he generates desire, strives, arouses persistence, comprehends with his mind, and makes an effort, both to prevent the arising of unarisen harmful unwholesome mental qualities and to abandon existing ones, and to bring forth and develop unarisen wholesome mental qualities and enhance those that have arisen. This, bhikkhus, is called the faculty of energy.
And what, bhikkhus, is the faculty of mindfulness? Here, bhikkhus, a disciple of the noble ones is fully attentive, equipped with utmost mindfulness, able to recall and reflect upon things done and said long ago. He practices by observing the body in and of itself, with continuous effort, fully aware and being present, having removed craving and displeasure with regard to the world. Similarly, he applies this practice to feelings, mind, and mental qualities, dwelling as an observer who if fully aware and remains present, eradicating any worldly desires and displeasure. This is called the faculty of mindfulness.
And what, bhikkhus, is the faculty of collectedness? Here, bhikkhus, a disciple of the noble ones, having made letting go his basis, attains stability of mind, attains unification of mind. Having secluded from sensual pleasures and unwholesome mental qualities, he enters and dwells in the first jhāna, which is accompanied by reflection and examination, born from seclusion, and is filled with joyful pleasure. With the settling of reflection and examination, he enters and dwells in the second jhāna, which is characterized by internal tranquility and unification of mind, is without reflection and examination, born from collectedness, and is filled with joyful pleasure. With the fading away of joyful pleasure, he dwells in a state of equanimity, mindful and fully aware, experiencing ease with the body. He enters and dwells in the third jhāna which the Noble Ones describe as 'one who dwells equanimous, mindful and at ease.' With the abandonment of ease and discontentment, and with the settling down of joy and sorrow, he enters and dwells in the fourth jhāna, which is characterized by purification of mindfulness through equanimity, experiencing neither-painful-nor-pleasant sensation. This, bhikkhus, is called the faculty of collectedness.
And what, bhikkhus, is the faculty of wisdom? Here, bhikkhus, a disciple of the noble ones is wise, endowed with the wisdom which discerns the arising and passing away [of phenomena], a wisdom that is noble and penetrative, and leads directly to the complete exhaustion of suffering. Such a disciple truly understands, 'This is suffering', 'This is the arising of suffering', 'This is the exhaustion of suffering', and 'This is the way of practice leading to the exhaustion of suffering'. This is called the faculty of wisdom.
These, bhikkhus, are the five faculties."