1"Bhikkhus, there are these Four Noble Truths. What four?

The noble truth of suffering, the noble truth of the origin of suffering, the noble truth of the cessation of suffering, the noble truth of the way leading to the cessation of suffering.

These Four Noble Truths, bhikkhus, are actual, unerring, not otherwise. Therefore they are called noble truths.[n.389] Spk: "Since they are actual, unerring, not otherwise, they are called the truths of the noble ones (ariyānaṁ saccāni); for the noble ones do not penetrate errors as noble truths." An explanation of the expression "noble truths" (ariyasacca) at Vism 495 (Ppn 16:20–22) quotes SN56.27 and 28, as well as SN56.23.

2"Therefore, bhikkhus, an exertion should be made to understand: ‘This is suffering.’[n.376] Tasmātiha bhikkhave idaṁ dukkhan ti yogo karaṇīyo. Spk: Since a concentrated bhikkhu understands the Four Noble Truths as they really are, therefore you should make an exertion to become concentrated in order to understand the four truths as they really are. And since the round of existence increases for those who do not penetrate them, but stops increasing from the time they are penetrated, therefore you should make an exertion to understand them, thinking, "Let the round not increase for us."
An exertion should be made to understand: ‘This is the origin of suffering.’
An exertion should be made to understand: ‘This is the cessation of suffering.’
An exertion should be made to understand: ‘This is the way leading to the cessation of suffering.’"

1"Cattārimāni, bhikkhave, ariyasaccāni. Katamāni cattāri?

Dukkhaṁ ariyasaccaṁ, dukkhasamudayaṁ ariyasaccaṁ, dukkhanirodhaṁ ariyasaccaṁ, dukkhanirodhagāminī paṭipadā ariyasaccaṁ –

imāni kho, bhikkhave, cattāri ariyasaccāni tathāni avitathāni anaññathāni; tasmā ‘ariyasaccānī’ti vuccanti.

2Tasmātiha, bhikkhave, ‘idaṁ dukkhan’ti yogo karaṇīyo … pe … ‘Ayaṁ dukkhanirodhagāminī paṭipadā’ti yogo karaṇīyo"ti.

Sattamaṁ.