When we are no longer able to change a situation - we are challenged to change ourselves. Viktor E. Frankl
Knowledge has to be improved, challenged, and increased constantly, or it vanishes. Peter Drucker
Our national determination to keep free of foreign wars and foreign entanglements cannot prevent us from feeling deep concern when ideals and principles that we have cherished are challenged. Franklin D. Roosevelt
I've arrived at the place if I'm not taking a career risk, I'm not happy. If I'm scared, then I know I'm being challenged. Jim Carrey
Workers have kept faith in American institutions. Most of the conflicts, which have occurred have been when labor's right to live has been challenged and denied. John L. Lewis
