“Discontent is the first step in progress. No one knows what is in him till he tries, and many would never try if they were not forced to.”
“Discontent is the first step in the progress of a man or a nation.”
“Were there none who were discontented with what they have, the world would never reach anything better.”
“Restlessness is discontent — and discontent is the first necessity of progress. Show me a thoroughly satisfied man — and I will show you a failure.”
“That's what was great about him. He tried. Not many do.”
“It only shows how true the old saying is, that a man never knows what he can do till he tries, gentlemen. From "Pickwick Papers" ch. 49 page 646”