My definition of success is reaching your goals.
Motivation is the rocket fuel that propels you to success. Growth is what makes your success stick.
Let's say you want to become a millionaire. The million you earn is only the surface. Unless you become a millionaire on the inside, your million will disappear.
Another example:
Being thin starts from the inside out. If you don't, you'll lose a lot of weight and gain it back.
That's why my coaching objective is always twofold: success and growth.