Its more than just a motivational quote. Its reality. Whatever you think, it happens in your life. This is the logic behind how the thoughts lead to destiny or career. Thoughts lead to actions. Whatever you do is based on the thoughts you have. So, if you reap good thoughts that will lead to positive actions. Any action repeated, automatically becomes your habit. So, repeated positive actions will lead to better habits. Habit over a period of time manifest as your behaviour. So, better habits will lead to sensible behaviour. And behaving in a particular way for over a period of time become your character. So, if you reap sensible behaviour that will lead you to develop a genuine character. And your career is decided by your character. You don't get what you expect, you get what you are. So, your character lead you to your career. So, if you possess a genuine character that will lead you to have a great career.