Part of the ongoing Verse Quick Reference project.
Psa 55:19 God will give ear and humble them, he who is enthroned from of old, Selah because they do not change and do not fear God.
The phrasing of Psalms 55:19 mirrors that of Malachi 3:6: “For I the LORD do not change; therefore you, O children of Jacob, are not consumed.”. The “not changing” is linked to a resulting action. In Malachi, because God does not change then Israel is not destroyed. In Psalms 55, because the wicked do not change then they do not fear God.
Psalms 55 is a call of King David for justice. He calls on God to act and to save him. Like many of these Psalms, the chapter then leads into a proposed punishment of the wicked. Because the wicked have attacked David for so long, without changing, they will be punished.
The verse is not about complete metaphysical immutability of man. It is using normal language to describe man’s unwillingness to repent. Similar language is used about men who remain faithful in Psalms 15:4. The “not changing” is limited to a character statement, and not to be understood outside that scope.