There is no wisdom, no insight, no plan that can succeed against the LORD.  The horse is made ready for the day of battle, but victory rests with the LORD (Proverbs 21:30-31).

You can make all the wicked plans you want to make -- but it doesn't mean those plans are going to work out.  No matter how clever, how insightful, how creatively thought out -- there's no wisdom, no insight, no plan that can succeed against the LORD.  It's reassuring to know that the will of God is the ultimate trump card.

But by the same token, it's important to note that you can make all the righteous plans you want to make -- but it doesn't mean those plans are going to work out.  No matter how meticulous, how carefully considered, how well-intended -- the preparation is all secondary.  The horse, if you will, is made ready for the day of battle, but victory rests with the LORD.  Once again, the will of God is the ultimate trump card.

It's both reassuring and unsettling to realize how powerful God's sovereignty really is.  This doesn't mean that we should be paralyzed by indecision -- always second-guessing ourselves.  But it does mean that we should maintain a modicum of humility at all times and in all situations.  Of course, you could try to go at it on your own and see how that works out for you; but they say that you should never bet against the house... And it seems to me that there's a reason for that.