A Fingernail
At Sāvatthī.
Then the Buddha, picking up a little bit of dirt on his fingernail, addressed the mendicants:
“What do you think, mendicants?
Which is more: the little bit of dirt on my fingernail, or this great earth?” [1]
“Sir, the great earth is far more.
The little bit of dirt on your fingernail is tiny.
Compared to the great earth, it doesn’t count, there’s no comparison, it’s not worth a fraction.”
“In the same way the sentient beings reborn as humans are few,
while those not reborn as humans are many.
So you should train like this:
‘We will stay diligent.’
That’s how you should train.”