A church member pointed this children's poem out to me. It comes from the book Peace on Earth: A Christmas Collection which was put together by Mary Engelbreit. The poem is written by James Freeman Clarke.
Let everyone be himself, not try to be someone else. God, who looked on the world He had made and said it was all good, made each of us to be just what our own gifts and faculties fit us to be. Be that and do that and so be contented. Reverence, also, each other's gifts; do not quarrel with me because I am not you, and I will do the same. God made your brother as well as yourself.
He made you, perhaps, to be bright; he made him slow; he made you practical; he made him speculative; he made one strong and another weak, one tough and another tender; but the same God made us all. Let us not torment each other because we are not all alike, but believe that God knew best what he was doing in making us so different. So will the best harmony come out of seeming discords, the best affection out of differences, the best life out of struggle, and the best work will be done when each does his own work, and lets everyone else do and be what God made for him.