The James–Lange Theory of emotion, developed independently by American philosopher-psychologist William James (1884) and Danish physician Carl Georg Lange (1885/1887), proposes a radical reversal of common sense: we do not tremble because we are afraid; rather, we feel afraid because we tremble. Emotions arise from the perception and interpretation of bodily changes triggered by stimuli, making physiology primary and subjective feeling secondary, an idea that helped launch modern scientific psychology and psychophysiology by insisting that emotions are embodied processes grounded in measurable biological responses. From a Christian perspective, this emphasis on embodiment resonates strongly with biblical anthropology, which affirms the unity of body and soul rather than a sharp dualism (e.g., Genesis 2:7; Psalm 139:13–14), and is deepened theologically by the Incarnation, “the Word became flesh” (John 1:14), which validates bodily life as a site of meaning and spiritual formation. Scripture also recognises the tight coupling of bodily states and emotional life (“a cheerful heart is good medicine,” Proverbs 17:22), while calling believers to embodied worship and moral responsibility (Romans 12:1; 1 Corinthians 6:19–20). Read this way, the James–Lange framework can serve personal wellbeing by encouraging attentiveness to bodily cues (sleep, breath, posture, stress) as spiritually and psychologically significant, fostering practices of self-care, prayer, and emotional regulation, and it can promote societal health by shaping compassionate public approaches to mental health that honour the whole person (biological, emotional, and spiritual) thereby supporting communities that are more humane, responsive, and resilient.