1"Bhikkhus, make an exertion in seclusion. A secluded bhikkhu understands things as they really are." sn.iv.81

"And what does he understand as they really are?

He understands as it really is: ‘The eye is impermanent.’
He understands as it really is: ‘Forms are impermanent.’
He understands as it really is: ‘Eye-consciousness is impermanent.’
He understands as it really is: ‘Eye-contact is impermanent.’ …
He understands as it really is: ‘Whatever feeling arises with eye-contact as condition— whether pleasant or painful or neither-painful-nor-pleasant— that too is impermanent.’

He understands as it really is: The ear … the nose … the tongue … the body … are all impermanent.

"He understand as it really is: ‘The mind is impermanent.’ …
He understand as it really is: ‘Whatever feeling arises with mind-contact as condition … that too is impermanent.’

"Bhikkhus, make an exertion in seclusion. A secluded bhikkhu understands things as they really are."

1"Paṭisallāne, bhikkhave, yogamāpajjatha. Paṭisallīno, bhikkhave, bhikkhu yathābhūtaṁ pajānāti.

Kiñca yathābhūtaṁ pajānāti?

‘Cakkhu aniccan’ti yathābhūtaṁ pajānāti; ‘rūpā aniccā’ti yathābhūtaṁ pajānāti; ‘cakkhuviññāṇaṁ aniccan’ti yathābhūtaṁ pajānāti; ‘cakkhusamphasso anicco’ti yathābhūtaṁ pajānāti.

… pe …

‘yampidaṁ manosamphassapaccayā uppajjati vedayitaṁ sukhaṁ vā dukkhaṁ vā adukkhamasukhaṁ vā tampi aniccan’ti yathābhūtaṁ pajānāti.

Paṭisallāne, bhikkhave, yogamāpajjatha. Paṭisallīno, bhikkhave, bhikkhu yathābhūtaṁ pajānātī"ti.

Sattamaṁ.