众人拾柴火焰高

zhòng rén shí chái huǒ yàn gāo

lit. when everybody gathers fuel, the flames are higher (proverb)

fig. the more people, the more strength

zhòng

variant of 眾|众[zhong4]

rén

person; people

shí

to pick up

chái

firewood

huǒ

fire

yàn

variant of 焰[yan4]

gāo

high