Even in the healthiest of relationships, a spouse’s or lover’s happiness isn’t necessarily our own. It’s rarely the case, for example, that upon hearing about a partner’s infidelity, people say “Oh, that’s nice! I love my partner, and I’m sure they had fun – so this is great news!”

— Steve Stewart-Williams A Billion Years of Sex Differences: How Evolution Shaped the Minds of Men and Women (2026)

More quotes by Steve Stewart-Williams

The Ape That Understood the Universe: How the Mind and Culture Evolve (2018)

The Ape That Understood the Universe: How the Mind and Culture Evolve (2018)

The Ape That Understood the Universe: How the Mind and Culture Evolve (2018)

A Billion Years of Sex Differences: How Evolution Shaped the Minds of Men and Women (2026)

Darwin, God and the Meaning of Life: How Evolutionary Theory Undermines Everything You Think You Know (2010)

Quote text and notes from Wikiquote: Steve Stewart-Williams (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.