This week will include Friday the 13th. Whatever you do on that day, don't walk under a ladder, cross paths with a black cat, or break a mirror! There's no telling what tragedy could result. What gives on this weird superstition? No, it doesn't have anything to do with the Knights Templar. Historically, 13 has long been considered an unlucky number. There also developed the idea of Friday being unlucky. Then Thomas Lawson combined them in his 1907 novel Friday the Thirteenth, and popular culture took over from there.

Luck, then, has become a fundamental necessity every Friday the 13th. But generally speaking, luck isn't a clear cut as it may initially seem. Is it real? There may be a certain randomness to the universe, but is the concept of "luck" the best way to describe it? Does it all shake out in the end? Someone that seems lucky in business could be incredibly unlucky in their personal lives. Is luck good? Does it encourage us to rely on something else, instead of on our own hard work? And if we have luck, can we ever really know it? Cormac McCarthy said, "You never know what worse luck your bad luck has saved you from." It almost makes it feel...unlucky.

Whether you're a believer in luck or not, here are 13 quotes to put it all in perspective this Friday the 13th:

The opinions expressed here by Inc.com columnists are their own, not those of Inc.com.

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These Quotes Will Bring the Luck You Need on Friday the 13th - Inc.