and lean not on your own understanding;
6 in all your ways submit to him,
and he will make your paths straight.  

To “trust in the Lord” is a total dependence upon God. When we trust in the Lord, we leave the most valuable thing we possess, our immortal soul, to the safekeeping of the Lord Jesus Christ. Second is Renunciation. “Lean not on your own understanding” means that God knows the way and we don’t.