1- As Long As You Are Alive Anything Is Possible
The only valid excuse you have to give up is if you are dead. As long as you are alive (and healthy and free) you have the choice to keep trying until you finally succeed.
2- Be Realistic
The chance of mastering something the first time you do it is almost non-existent. Everything takes time to learn and you will make mistakes. Learn from them.
3- Michael Jordan
Arguably the best basketball player of all time. He attributes his success to all his failures. He just never gave up even when he...