Origin
The exact origin of this phrase is Isaiah, but later Dr. King used this phrase in his speech at a college rally when he said, “If you can’t fly then run, if you can’t run then walk, if you can’t walk then crawl, but whatever you do you have to keep moving forward.” In fact, he is motivating the youth that how much pessimistic they might become, they have to move forward to fight for their rights and justice.