To be a good loser is to learn how to win.
Do not weep do not wax indignant. Understand.
If you've got a talent, protect it.
If you're going through hell, keep going.
Either you run the day or the day runs you.
Only the educated are free.
Leap, and the net will appear.
Be gentle to all and stern with yourself.
To know oneself, one should assert oneself.
Know or listen to those who know.
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.