The ultimate test of man’s conscience may be his willingness to sacrifice something today for future generations whose words of thanks will not be heard.
Gaylord Nelson (1916-2005) American politician and environmentalist
“Ah, Wilderness! Save It,” New York Times (4 Sep 1984)
(Source)
Here’s a link to the article: http://nyti.ms/2fdxicg.
Thanks, Hugh. I have added that to the Source link.