testing = success

"The more I practice, the luckier I seem to get.""If you think safety is expensive, just try having an accident."

The two quotes above I think pretty accurately sum up the importance of preparation and planning. The first has been attributed to various professional golfers over the years and suggests luck is never accidental. If things work, they work for a reason and that reason is usually because of good preparation, not good luck.
The second quote has been attributed to various airline industry executives. Here the message is that however much time, and inevitably money, that you spend making sure your planes do not crash, it will cost you considerably more if one of them does.
The real message is of course that planning and preparation pay off in the long term.