九層の台は累土より起こる（きゅうそうのうてなはるいどよりおこる）

Japanese vocabulary

Meaning: many a little makes a mickle; every little helps; the tower of nine storeys (stories) rose from a small heap of earth

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “九層の台は累土より起こる” pronounced in real videos (YouGlish)