"One of the commonest mistakes and one of the costliest is thinking that success is due to some genius, some magic - something or other which we do not possess. Success is generally due to holding on, and failure to letting go. You decide to learn a language, study music, take a course of reading, train yourself physically. Will it be success or failure? It depends upon how much pluck and perseverance that word "decide" contains. The decision that nothing can overrule, the grip that nothing can detach will bring success." Maltbie Davenport Babcock
Stick to it.
It takes gumption (that is fortitude and determination).
According to Dave Barry, duct tape is one of the six fundamental forces of the universe.
Motivation is a decision and duct tape is the habit that keeps you on course. Remember the purpose you wrote down yesterday? Put a piece of duct tape on it as a reminder to stick to it.