"The present outlook is that reason and enlightened selfishness will eventually triumph over the suspicions, ignorance, and greed from which wars arise, and that an era of universal peace will be ushered in."
Duruy, V., Grosvenor, E. A., & Van Norman, L. E. 1912. A General History of the World, Vol. VI. New York: The Review of Reviews Co.
Nice though that sounds, it wasn't true back in 1912 or in any time since. And to be honest, I cannot imagine a time when we could have universal peace.