Trust in the Lord with all thine heart and lean not unto thine own understanding.
So when he talks about our own understanding of verse five, that's contrasted with the good understanding of verse four that comes from the truth of God's word,
that comes from his commandments, that comes from God's law.
See, that's where we get good understanding from reading the Bible, from getting God's commandments and God's laws and walking in those ways.
Then the Bible says, lean on that, trust that, don't trust in your own understanding.
In all your ways acknowledge him and he shall direct thy paths.
What's being taught here is that if we read the Bible, study the Bible, learn the Bible, and then we strive to obey God's word in our lives,
not to do things our way, but to do things his way, God will direct our paths, God will lead us.
So you say, well, is the Bible have all the answers for my life? Is it going to tell me every decision that I need to make?
It's not going to spell out specifically what to do in every situation, but if we follow what the Bible says,
he will direct our paths and guide our decisions and make sure that we end up where he wants us to be.