Inspiration is free flow, abundance and ease. Motivation, always has a motive.
Motivation is a stimulation of interest, that attempts to get us where we want to go, through the application of extensive effort.
Inspiration shows up in the absence of force, and thrives in an atmosphere of relative ease.
We could motivate ourselves to do almost anything that has already been done before.
But to create and allow what we desire the most, we must be inspired.