In this context, you can assume that "voice" refers to essentially their opinion. Their different "voices" each express different point of view; like our opinion that differs from others. Not to mention, that we must express our own voices because it brings out new ideas and these new ideas bring about changes. Thus, we should not hush children that try to express their own voices. Children have wild imagination, they have the freedom of imagination that we do not. They are not inhibited by the thought of consequences like we are; they are free to think of new ideas that could bring about…