Get Around to it for motivation.
Automatic Pilot for commitment.
Motivation comes first and then commitment. But they also go in cycles between the two building on each other. If a person is very motivated they'll tend to be more committed and vice versa.
A example that we are all familiar with is a relationship. We are motivated to love at first and then when choose deeper and deeper levels of commitment to a person.
A motivation is more a drive while a commitment is more a decision.
Motivation is an emotion while commitment is from your intellect.
Motivation is the starting point, commitment makes the plans.
Motivation is for the power, commitment is for the smooth ride.
Motivation is for the pull, commitment is to squelch the silly sabotaging self-talk.
Get Around To It is for the beast in us while Automatic Pilot is for the frontal lobes.