You only have one chance to make a good first impression.
You're known by the company you keep.
Respect is earned not given.
Fool me once, shame on you. Fool me twice, shame on me.
(fool me three times , call me George W Bush)
History has a tendency to repeat itself. (or, something like that)
A leopard can't change his spots.
Contributions to the list are welcomed. ( :