Spiritual life (1) Spaniards (1) Religion (1) Optimism (1) Muslims (1) Human behavior (1) College students (1) College graduates (1) Christians (1) Optimismo (1) Titulados universitarios (1) Estudio (1) Cristianos (1) Conducta (1) Estudiantes universitarios (1) Vida espiritual (1) Religión (1) Españoles (1) Musulmanes (1) spiritualité (1)