Eastern Gatehouse
Pubbakoṭṭhaka Sutta  (SN 48:44)

I have heard that on one occasion the Blessed One was staying near Sāvatthī at the Eastern Gatehouse. There he addressed Ven. Sāriputta: “Sāriputta, do you take it on conviction that the faculty of conviction, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation? Do you take it on conviction that the faculty of persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation?”

“Lord, it’s not that I take it on conviction in the Blessed One that the faculty of conviction… persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation. Those who have not known, seen, penetrated, realized, or attained it by means of discernment would have to take it on conviction in others that the faculty of conviction… persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation; whereas those who have known, seen, penetrated, realized, & attained it by means of discernment would have no doubt or uncertainty that the faculty of conviction… persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation. And as for me, I have known, seen, penetrated, realized, & attained it by means of discernment. I have no doubt or uncertainty that the faculty of conviction… persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation.”

“Excellent, Sāriputta. Excellent. Those who have not known, seen, penetrated, realized, or attained it by means of discernment would have to take it on conviction in others that the faculty of conviction… persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation; whereas those who have known, seen, penetrated, realized, & attained it by means of discernment would have no doubt or uncertainty that the faculty of conviction… persistence… mindfulness… concentration… discernment, when developed & pursued, gains a footing in the deathless, has the deathless as its final end & consummation.”

See also: SN 12:68; AN 6:19–20; AN 7:46; AN 10:58