War originated from people's minds, so we should build a barrier to defend peace in people's minds. Which country did people say this sentence?

War originated from people's minds, so we should build a barrier to defend peace in people's minds.

This sentence is a sentence in the law of UNESCO.

The English version of this motto is as follows:

Since war begins in people's minds, it is necessary to build a barrier to defend peace in people's minds.

She has been lonelier than fireworks since she knew the team ~