Without contraries is no progression.
progress
A selected quote by William Blake.
Without contraries is no progression.
Related
Immigrant: An unenlightened person who thinks one country better than another
I have always thought the actions of men the best interpreters of their thoughts.
Cynic: A blackguard whose faulty vision sees things as they are, not as they ought to be
Optimist: A proponent of the doctrine that black is white
Men are disturbed not by things, but by the views which they take of things.