Planning vs Directing
When man comes up with an idea, a plan or a way of doing something, it is always flawed.
Man may think his way doesn't have holes in it, but in fact, it has many.
Man may argue that his plan isn't full of contradictions, but the reality is, it's choke-full of them.
To biblically plan for success, a man must allow for his plans to be changed, revised or replaced with a better one. In other words, the Lord better be in it!
It's ok for man to plan, as long as GOD directs.
Proverbs 16:9 A man's heart deviseth his way: but the LORD directeth his steps.