Trust in the LORD with all your heart and lean not on your own understanding; 6 in all your ways acknowledge him, and he will make your paths straight.

That's the full verse. It's basically saying to not trust yourself, but to trust God and obey His law. Our hearts are deceitful, we cannot trust our own intuitions to lead us. If you think you can, go ahead and do it, but I don't. I choose to lean on God's word. My mind is submitted to the word of God.