A man doesn't know what he knows until he knows what he doesn't know.
In spite of warnings, nothing much happens until the status quo becomes more painful than change.
If we lacked imagination enough to foresee something better, life would indeed be a tragedy.
In most hierarchies, supercompetence is more objectionable than incompetence.
Many an optimist has become rich simply by buying out a pessimist.
Noblest of all dogs is the hot-dog; it feeds the hand that bites it.