Expect problems and eat them for breakfast.
If you think you can do it, you can.
Problems are not stop signs, they are guidelines.
Go for it now. The future is promised to no one.
Leap, and the net will appear.
Never complain and never explain.
I can, therefore I am.
It's always too early to quit.
Be gentle to all and stern with yourself.
To be a good loser is to learn how to win.
I studied voice for about two years with an amazing coach, and I never rose above the level of mediocre.
I think there are a lot more writers who are actors than you know they just don't have roles on famous TV shows that you recognize.