In computing, turning the obvious into the useful is a living definition of the word 'frustration'.
You will never be able to escape from your heart. So it's better to listen to what it has to say. That way, you'll never have to fear an unanticipated blow.
晏子春秋
The tyrant dies and his rule is over, the martyr dies and his rule begins.
The market is always changing, and you have to be able to adapt.