Who is credited with saying, "There is no real wealth but the labor of man"?
Percy Shelley,
George Shaw
Abraham Lincoln

I think that Shelley said that because he was very concerned with the common man. Of course, he was a romantic and viewed the common laborer as holding the meaning to life and beauty. Not that Shelley would give up his class position to join the common man, hehe.

All that harms labor is treason to America. No line can be drawn between these two. If a man tells you that he loves America, yet he hates labor, he is a liar. If a man tells you he trusts America, yet he fears labor, he is a fool. I am glad to see that a system of labor prevails under which laborers can strike when they want to ...I like the system that lets a man quit when he wants to and wish it might prevail everywhere. The strongest bond of human sympathy, outside of the family relation, should be uniting all working people of all nations, tongues and kindreds.~Abraham Lincoln