Mahāparinibbāna Sutta 1.10.3

1.10.3

“Evaṃ, bhante”ti kho te bhikkhū bhagavato paccassosuṃ.

'Other seven conditions of welfare will I teach you, O brethren. Listen well, and attend, and I will speak.'
And on their expressing their assent, he spake as follows:
'So long as the brethren shall exercise themselves in the sevenfold perception due to earnest thought, that is to say, the perception of impermanency, of non-individuality, of corruption, of the danger of sin, of sanctification, of purity of heart, of Nirvâna, so long may the brethren be expected not to decline, but to prosper.
'So long as these conditions shall continue to exist among the brethren, so long as they are instructed in these conditions, so long may the brethren be expected not to decline, but to prosper.'