Monks, whatever Arahants, Perfectly Enlightened Ones, in the past fully awakened to things as they really are, all fully awakened to The Four Noble Truths as they really are.

Whatever Arahants, Perfectly Enlightened Ones, in the future will fully awaken to things as they really are, all will fully awaken to The Four Noble Truths as they really are.

Whatever Arahants, Perfectly Enlightened Ones, at present have fully awakened to things as they really are, all have fully awakened to The Four Noble Truths as they really are.

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.

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 56.5)

In this Teaching from Gotama Buddha, he shares that any Fully Perfectly Enlightened Buddha, a Tathāgata, in the past, currently, and in the future would need to awaken to the wisdom of The Four Noble Truths.

The Four Noble Truths is what establishes “Right View” and all other Teachings on The Path to Enlightenment are built upon learning, reflecting, and practicing The Four Noble Truths.