Taker, I'll give you the closest translation but I advise you to wait for a better answer from an expert:

السكوت عن الأحمق جوابه: <em>Silence with the fool/ idiot is the answer.</em>

يفعل الجاهل بنفسه مالا يفعله العدو بعدوهِ: <em>The ignorant does to himself what won't be done to him by his enemy/</em>

<em>The ignorant harms himself more than being harmed by his enemy.</em>

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Thank you

I think : "The ignorant harms himself more than being harmed by his enemy". is okay