The Perfectly Enlightened One

Monks, there are these Four Noble Truths.

What four?

The noble truth of discontentedness, the noble truth of the cause of discontentedness, the noble truth of the elimination of discontentedness, the noble truth of the way leading to the elimination of discontentedness.

It is because he has fully awakened to these Four Noble Truths as they really are that The Tathāgata is called the Arahant, The Perfectly Enlightened One.

Therefore, Monks, an effort should be made to understand: ‘This is discontentedness’; an effort should be made to understand: ‘This is the cause of discontentedness’; an effort should be made to understand: ‘This is the elimination of discontentedness’; an effort should be made to understand: ‘This is the way leading to the elimination of discontentedness.’

(Reference: SN 56.23)

In this Teaching from Gotama Buddha, he establishes yet again, how important and central The Four Noble Truths are to The Teachings that lead to Enlightenment and that a Practitioner should make the effort to understand these truths.