Definitions: (1) a spontaneous or natural liking or sympathy for someone or something; familial, friends, or group ties; (2) like-minded in ideas, ideals, political or religious affiliations; (3) sympathetic of empathetic attraction

• Love is the affinity which links and draws together the elements of the world… Love, in fact, is the agent of universal synthesis. — Pierre Teilhard de Chardin (1881-1955) French Jesuit priest
• The power of affinity lies in its mystery: the way it stands outside everything logical; you step into a crowded room and see a stranger, and somehow you feel you know her better than you know the friends you came with. — Siddharth Pico Raghavan Iyer (1957-) British essayist & novelist

Comment: Physically elements on the periodic table have affinity or lack of affinity naturally. Certain personality types flock together. All values have positive mutual attraction, even those which seem distant have common ancestry.