" Typically introverted and analytical, Fives don’t believe they have enough inner resources or energy to meet the demands of life. They feel drained by prolonged involvement with other people or by having too many expectations placed on them. Every handshake, phone call, business meeting, social gathering or unexpected encounter seems to cost them more than it does other people. Fearful they don’t have sufficient inner resources to function in the world, they detach and withdraw into the mind, where they feel more at home and confident. "

― Ian Morgan Cron , The Road Back to You: An Enneagram Journey to Self-Discovery