The Second Discourse about Nibbāna

Thus I heard: At one time the Gracious One was dwelling near Sāvatthī, in Jeta’s Wood, at Anāthapiṇḍika’s monastery. Then at that time the Gracious One was instructing, rousing, enthusing, and cheering the monks with a Dhamma talk connected with Emancipation. Those monks, after making it their goal, applying their minds, considering it with all their mind, were listening to Dhamma with an attentive ear.
Then the Gracious One, having understood the significance of it, on that occasion uttered this exalted utterance:

“What is called ‘the uninclined’ Emancipation is hard to see,
for it is not easy to see the truth,
For the one who knows, who has penetrated craving,
for the one who sees there is nothing no defilements.”