Motivation and Inspiration have been confused topics for decades. Inspirations are external events that can fuel the fires within someone, passion, enthusiasm, etc. Motivation is an internal mechanism, it’s whether or not there is even that fire burning in the first place. Motivation is a choice people make to take action on a moment to moment basis. Inspiration can elevate the intensity of someones actions but is rarely the cause of one’s choice to act in the first place. The decision to take action is always intrinsic.
Here is a fantastic book on the subject by Daniel Pink. I highly recommend it for anyone in a leadership role or just wants a better understanding of human motivation.