Who said "Contradiction is the engine of all progress."?

This quote is attributed to Priest, Graham.

Contradiction is the engine of all progress. - Priest, Graham

"Contradiction is the engine of all progress."

Priest, Graham Change

Philosopher-Logician Australian Born 1948 (age 78)

"Contradiction is not inconsistency."

"A contradiction at the level of thought does not mean reality is contradictory."

"Logic is the study of the laws of thought."

"Paraconsistency allows for true contradictions."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."