combining a little by little can accumulate to a big amount
Definitions (粵典–words.hk)
語句
同積少成多嘅意思一樣，只要啲嘢夠多，就算只係好微細都足夠成事；字面意思就係只要個山夠大，點都會斬到足夠嘅柴嚟燒 an expression meaning one can achieve a lot by proceeding in small steps, or make a lot of money by accumulating lots of small profits, literally "on a mountain big enough you can cut enough firewood"