Everyone talks about peace, but no one teaches peace. In this world you are educated for competition, and competition is the beginning of every war. When he will educate himself for cooperation and to offer each other solidarity, that day he will be educating himself for peace.
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Gender-neutral pluralized version:

Everyone talks about peace, but no one teaches peace. In this world you are educated for competition, and competition is the beginning of every war. When people will educate themselves for cooperation and to offer each other solidarity, that day they will be educating themselves for peace.