Psalms 36:1 – An oracle is within my heart about the disobedience of the wicked: "There is no fear of God before his eyes."
The reason for the disobedience of the wicked is that they have no fear of God. They’re not worried or concerned about what God thinks of their actions, nor of His consequences for sin.
We were never designed to be masters of our own destiny, answerable to no-one. Instead, we were made to bring glory and worship to God, and to live in humility and reverence toward Him.
This has a direct practical application too – any area of ongoing sin in our lives is usually an area where we don’t fear the consequences (or don’t care about the consequences). Having a correct view of both the kindness and sternness of the Lord is the key to walking in righteousness.