Might makes right
Might - Power (both physical and psychological)
Right - The ability to enact changes onto the environment

Train muscles to move an object.
Train the mind to understand something.

Physically, might makes right, because someone with high physical power can threaten to harm someone of lower physical power if he doesn't comply with his right.
Psychologically, might makes right, because someone with high psychological power can convince someone with high physical power to follow his right.