What the Bible says about Body at Rest tends to Stay at Rest
(From Forerunner Commentary)
This section describes the principle, or law, of inertia. Inertia is the tendency to remain in a fixed position or condition. If matter is in motion, its tendency is to remain in motion. It will move in the direction it is presently traveling unless some external force impels it in another direction. If matter is motionless, its tendency is to remain motionless unless an external force impels it into motion.
Jesus is saying that the same tendency exists regarding the things of God—the acceptance of truth and acting upon it. People have a strong tendency to hold fast to what they feel secure with.
John W. Ritenbaugh
What Is the Work of God Now? (Part One)