Newton’s law of inertia states that if a body is at rest or moving in a straight line, it will continue to stay at rest or move in its straight line until it is acted upon by an external, unbalanced force.
Essentially: things tend to continue doing what they’re already doing until something interferes.
A car in motion will continue in motion until; brakes are applied; air resistance and friction with the road bring it to a gradual standstill; or it collides with something.
Like cars hurtling down the freeway, our lives are in a state of inertia too. We are so engrained in our habits, our little rattles and splutters, that until something stuns us into change, we usually don’t.