In suffocating the voice of conscience, passion carries with itself a restlessness of the body and the senses: it is the restlessness of the "external man." When the internal man has been reduced to silence, then passion, once it has been given freedom of action, so to speak, exhibits itself as an insistent tendency to satisfy the senses and the body.

Blessed Are the Pure of Heart: Catechesis on the Sermon on the Mount and Writings of St. Paul