Address at the Dedication of Boulder Dam
09/29/1935
https://www.presidency.ucsb.edu...
Experience is the best teacher and results are the best evidence.
I think we can safely disregard the skeptics of whom you speak.
Skeptics were present when Noah said it was going to rain and they refused to go into the ark.
I take it that we are all not merely seeking but getting the recovery of confidence.