“The story of your species is indeed a tragic story, for it closes with desolation. Your part in that story is both to strive and to fail in a unique opportunity, and so to set the current of history toward disaster. But think not therefore that your species has occurred in vain, or that your own individual lives are futile. Whatever any of you has achieved of good is an excellence in itself, and a bright thread woven into the texture of the cosmos.”