What then, is an absolute?
Everything in existence is an absolute, whether men recognize it or not.
God created everything for one reason -- His good and holy pleasure absolutely.
Men write with gray chalk that eventually fades away. God is the only indelible ink.
"Self-evident moral truths" are absolute truths --- true for all people in all places at all times down through history.
(Hint, hint -- ever hear of the Constitution? It's only purpose is to guard absolute moral truth (our inalienable God-given rights) - "We hold these truths to be self-evident that ...."). Unless it is effectively guarding absolute moral truths, it is a meaningless document.