The Buddha explains the importance of accomplishment in virtue, aspiration, self-development, view, and diligence in the development and cultivation of the noble eightfold path.
Sīlasampadādi suttapañcaka - Five Discourses Beginning With Accomplishment in Virtue
45.64
"One thing, bhikkhus, is greatly beneficial for the arising of the Noble Eightfold Path. What is that one thing? It isaccomplishment in virtue. For a bhikkhu who is accomplished in virtue, bhikkhus, it is to be expected that he will develop and extensively cultivate the Noble Eightfold Path.
And how, bhikkhus, does a bhikkhu who is accomplished in virtue develop and extensively cultivate the Noble Eightfold Path? Here, bhikkhus, a bhikkhu develops right view dependent on seclusion, supported by dispassion, based on ending, culminating in complete relinquishment; similarly he develops right intention, right speech, right action, right livelihood, right effort, right mindfulness, and right collectedness, dependent on seclusion, supported by dispassion, based on ending, culminating in complete relinquishment. It is in this way, bhikkhus, that a bhikkhu who is accomplished in virtue develops and extensively cultivates the Noble Eightfold Path."
45.65
"One thing, bhikkhus, is greatly beneficial for the arising of the Noble Eightfold Path. What is that one thing? It is accomplishment in aspiration. For a bhikkhu who is accomplished in aspiration, bhikkhus, it is to be expected that he will develop and extensively cultivate the Noble Eightfold Path."
45.66
"One thing, bhikkhus, is greatly beneficial for the arising of the Noble Eightfold Path. What is that one thing? It is accomplishment in self-development. For a bhikkhu who is accomplished in self-development, bhikkhus, it is to be expected that he will develop and extensively cultivate the Noble Eightfold Path."
45.67
"One thing, bhikkhus, is greatly beneficial for the arising of the Noble Eightfold Path. What is that one thing? It is accomplishment in view. For a bhikkhu who is accomplished in view, bhikkhus, it is to be expected that he will develop and extensively cultivate the Noble Eightfold Path."
45.68
"One thing, bhikkhus, is greatly beneficial for the arising of the Noble Eightfold Path. What is that one thing? It is accomplishment in diligence. For a bhikkhu who is accomplished in diligence, bhikkhus, it is to be expected that he will develop and extensively cultivate the Noble Eightfold Path."