There's always room for improvement. I incorporate the lessons I learned from my mistakes and move forward.
Transformation is not a future event. It is a present activity.
The past does not define, you the present does.
Get comfortable with being uncomfortable!
I come from the school of being (stereotyped) since I was five years old. And I know that I should not be putting my personal issues on the table or letting them effect my work.
You can look for external sources of motivation and that can catalyze a change, but it won't sustain one. It has to be from an internal desire.