Aniccasutta
“‘So vata, bhikkhave, bhikkhu kañci saṅkhāraṁ niccato samanupassanto anulomikāya khantiyā samannāgato bhavissatī’ti netaṁ ṭhānaṁ vijjati. ‘Anulomikāya khantiyā asamannāgato sammattaniyāmaṁ okkamissatī’ti netaṁ ṭhānaṁ vijjati. ‘Sammattaniyāmaṁ anokkamamāno sotāpattiphalaṁ vā sakadāgāmiphalaṁ vā anāgāmiphalaṁ vā arahattaṁ vā sacchikarissatī’ti netaṁ ṭhānaṁ vijjati.
Impermanence
“Mendicants, it is quite impossible for a mendicant who regards any condition as permanent to accept views that conform with the teaching. Without accepting views that conform with the teaching, it’s impossible to step into the sure path. Without stepping into the sure path, it’s impossible to realize the fruit of stream-entry, once-return, non-return, or perfection.