Notes from Wikiquote
"Integrity means doing the right thing at all times, without hesitation" is found in a 1943 syndicated newspaper column. Elsie Robinson, "Listen, World!", Evening News (Harrisburg, PA), 1943-02-24, p. 10. | "Integrity means doing the right thing even when no one is there to judge" is found (unattributed) in the 1965 Journal of Clinical Psychology. | The quote became attributed to C.S. Lewis by 2012.