For ourselves and for the present, we are safe; our immediate peril is past. But for how long are we safe; and how far have we removed our peril? If our nation could not itself exist half slave and half free, are we sure that it can exist in a world half slave and half free? Is the same conflict less irrepressible when world wide than it was eighty years ago when it was only nation wide? Right knows no boundaries, and justice no frontiers; the brotherhood of man is not a domestic institution.

Learned Hand (1872-1961) American jurist

“A Pledge of Allegiance,” speech, Central Park, New York City (1945-05-20)
    (Source)

His second "I Am an American Day" address. Collected in The Spirit of Liberty (1953).