Discipline Quote

You don’t rise to the level of your motivation—you fall to the level of your habits - Michael Matthews
The core message is brutally simple: your success isn't dictated by how pumped up you feel, but by the quality of the automatic routines you've ingrained.

Beginning Quote

One good workout won’t change your life, but it will start it - Michael Matthews
The core message is about process over event. It's a direct refutation of the "magic pill" mentality. True, lasting change isn't a single grand gesture; it's the compound interest of small, consistent actions.
Motivation gets you started discipline keeps you going Meaning Factcheck Usage

Consistency Quote

Motivation gets you started, discipline keeps you going - Michael Matthews
The core message is brutally simple: Motivation is the match you strike; discipline is the log you keep on the fire. One gives you a starting point, the other ensures you don't burn out.