Fate can outwit the unwary, so its best to be on your toes at all times; take nothing for granted, and be ready for all eventualities.
Complacency, now that is a dangerous thing; based on today's experiences, its best not to get carried away with anything; even something you've taken for granted for a quarter of the century, and you'd thought you'd seen every possible outcome; every twist and turn.
Sometimes being caught unawares is a valuable lesson; its ditches the arrogance of the false ego right out the window, and it reminds the human being to be humble at all times. Experiencing the 'no,no,no' again is a sobering experience; but its a valuable lesson to teach that complacency can slip in when you least expect it. Every connection must be deemed as correct, and has to be explored in order to retain the accuracy that was once a trademark. Preparation is everything. End of lesson.