Charity runs on the power of small contributions adding up.
Tips
history
From the Lotus Sutra (《妙法莲华经·方便品》), where even a child piling sand into a stupa in play counts as a Buddhist merit. The phrase became a general metaphor for accumulation.
usage
Frequently paired with 集腋成裘 (gathering fur scraps into a coat) in the same sentence, reinforcing the same idea.