If they throw stones at you, don’t throw back, use them to build your own foundation instead.

如果有人给你扔石头,不要把石头扔回去,用那些石头来搭建自己的根基吧。

语言点:if they throw stones at you为条件状语从句,throw at意为:砸向某人;
to build your own foundation instead为不定式作目的状语。

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