Do unto others before others undo you!
The hardest thing to learn in life is which bridge to cross and which to burn.
If you're going to be wrong, be positively wrong.
Quod non est scriptum, non est in mundo -- If it is not written down, it doesn't exist.
Never tolerate -- always respect. Tolerance presumes yours is a superior position. Respect presumes yours is an equal one.
If you lost your left arm, your right arm would be left.
You can either prove a point or solve a problem, but never both at the same time.
It's not the employer who pays the wages. Employers only handle the money. It's the customer who pays the wages.
The average company loses about 20% of its customers each year.
Be thankful for problems. If they weren't so hard, someone with less ability might have your job.