" A marriage, she had learned, is seldom what it seems to be on the surface; what appears to be the most equable, well settled of arrangements might be a seething mass of discontent and resentment underneath. And conversely, chaotic and noisy relationships, littered with conflict and infidelity, might prove to be the most durable of unions. "

― Alexander McCall Smith , The Minor Adjustment Beauty Salon (No. 1 Ladies' Detective Agency #14)