Bhagavadgita As It Is, Philosophy, Sentimentality, Fanaticism

At the moment I am re-reading The Bhagavadgita As It Is translated into English and with purports - by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada. The following made an impression on me: "Religion without philosophy is sentiment, or sometimes fanaticism." Chapter Three Text Three.