When and why it was written

When

Published in 1961, from two decades of clinical practice.

Why

Rogers was accounting for something he kept seeing: clients changed after they stopped trying to.

What it means

Rogers calls it a paradox because it inverts the obvious order. Self-criticism looks like the engine of improvement.

What he observed clinically was the opposite. Effort spent defending against a trait keeps it in place, because the trait has to be maintained as the thing being fought. Acceptance is not approval here; it is putting the fight down long enough for movement to be possible.