Here is some classic wisdom from Coach Paul Reddick of the 90 MPH Club. Print this out and post it where you or your players can see them.
The 10 Commandments of Baseball
1. Nobody ever became a ballplayer by walking after a ball
2. You will never become a .300 hitter unless you take the bat off your shoulder and swing.
3. An outfielder who throws behind a base runner is locking the barn door after the horse is already gone.
4. Keep your head up and you may not have to hold it down.
5. When you start to slide, S-L-I-D-E. The runner who changes their mind may have to change a good leg for a bad one.
6. Do not alibi on bad hops. Anybody can field the good ones.
7. Always run them out. You can never tell.
8. Do not quit.
9. Do not find too much fault with the umpires. You cannot expect them to be as perfect as you are.
10. A pitcher who hasn’t got control, hasn’t got anything.