佛說佛名經 17.42

17.42

"Furthermore, bhikṣu, suppose a third person were to take the fine dust motes of that many worlds, pass that many worlds as there are fine dust motes in a single step, and traveling through that many hundreds of thousands of myriads of koṭis of nayutas of asaṃkhyeya kalpas, would only then deposit a single dust mote, exhausting all the fine dust motes in this manner. Suppose a fourth person were to take that number of worlds as there are fine dust motes, whether having had a dust mote placed in them or not, and fill them completely with fine dust motes down to the water limit and up to Bhavāgra. Bhikṣu, what do you think? Could the number of those fine dust motes be known?"