Inertia

Sir Isaac Newton in his first Law of Motion stated that an object will continue to be in its uniform velocity or remain at rest until being acted upon by an external force.

In paraphrase, Newton simply said that every body with mass is stubborn.
I agree very much with my paraphrase of course. In fact, it can be used as a metaphor for human behavior:

Everybody is stubborn.

Inertia is the resistance towards change of motion.
The greater the mass of an object, the greater is its inertia.