Samannaphalasutta 78.1

78.1

Seyyathāpi, mahārāja, udakarahado gambhīro ubbhidodako tassa nevassa puratthimāya disāya udakassa āyamukhaṃ, na dakkhiṇāya disāya udakassa āyamukhaṃ, na pacchimāya disāya udakassa āyamukhaṃ, na uttarāya disāya udakassa āyamukhaṃ, devo ca na kālena kālaṃ sammādhāraṃ anuppaveccheyya.

It’s like a deep lake fed by spring water. There’s no inlet to the east, west, north, or south, and the heavens would not properly bestow showers from time to time.