Pro 3:5 Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Pro 3:6 In all thy ways acknowledge him, and he shall direct thy paths.
Pro 3:7 Be not wise in thine own eyes: fear the LORD, and depart from evil.
Pro 3:8 It shall be health to thy navel, and marrow to thy bones.
Hey look, it's the heart again. Trust in the Lord is more than an intellectual exercise, as it involves actually doing something with it like trusting Him to lead us. Our own understanding can be flawed and we can be easily deceived. Be not wise in our own eyes... Remember the first time wisdom is mentioned in the bible?
Gen 3:6 And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.
There's some epic consequences for leaning on our own understanding!
I watched Fireproof this weekend. It is a great movie! And it shows some great examples of relying on our own wisdom. This married couple is very angry at each other, and they decide to give up. They both whine to their friends, and the woman's friends tell her all sorts of worldly wisdom trying to help her. Instead, it only makes worse a bad situation.
How likely is it our own understanding is so perfect it can accomplish anything on its own? Even those who do not believe in God have to accept the fact that our knowledge is not unlimited. There is simply not enough information available to see everything that leads to or everything that might stem from any particular choice we make in life. We think we can solve all of our problems, but really, when has that ever worked out? If it did very often, we wouldn't have phrases like "hindsight being 20/20."
The fear of the Lord is the beginning of wisdom because we place God in His proper place in our decision making ALL the time. I find it easy to place God first in some decisions, like ones that cost a lot of money, but harder in other decisions like my daily activities. But it is the day to day activities that we spend most of our time doing and have the largest cumulative effect. God should be first, always.