Ignorance is the mother of research.

Nobody can be perfect unless he admits his faults, but if he has faults how can he be perfect?

Middle age is when it takes longer to rest than to get tired.

If we lacked imagination enough to foresee something better, life would indeed be a tragedy.

In spite of warnings, nothing much happens until the status quo becomes more painful than change.

A man doesn't know what he knows until he knows what he doesn't know.

A pessimist is a man who looks both ways when he crosses the street.