Súhuàshuō zhòngrénshícháihuǒyàngāo, yīgè rén de lìliàng bìjìng yǒuxiàn.
As the saying goes, when everyone gathers firewood the flames rise high - one person's strength is limited after all.
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A 7-character proverb (俗语), not a 4-character chengyu - routinely introduced by 俗话说 or 正所谓. Feel is folksy and encouraging, good for team speeches and community contexts.
memory
Picture a bonfire: one person's armful of sticks makes a small blaze; ten people's sticks make a roaring fire. That literal image is exactly the point.
