Stirner felt that the liberalism of the Enlightenment, and the collectivist and socialist movements that fell out of the French Revolution, were just secular continuations of religion. Or plugging new spiritual ideas (rights and different universals) into the same slots of the old "ghosts" (former hallowed concepts).
There might even be something to his regarding "sacred" as an "alien or other" distinction that we thereby respect because it is "not my own", along with such a "higher essence" -- when it is the Plato-like general idea of "human" that we imagine immaterially dwelling in each of us ("haunts you") -- contributing to that moral reverence: "
If I didn’t see the human being in you, what reason would I have to respect you?" [not take your property, etc]
Max Stirner: "Political liberalism, like everything religious, counts on respect, humanity, the loving virtues. ... That is why they are continuations and consequences of the Christian principle, the principle of love, of sacrifice for something universal, something alien. ... Since they are enemies of egoism, they are therefore Christians, or more generally, religious people -- believers in ghosts, dependents, servants of whatever universal (God, society, etc.).
[...] the “higher essence” is for you—an alien thing. Every higher essence, like truth, humanity, etc., is an essence over us. [above us in hierarchy]
Alienation is a hallmark of the “sacred.” In everything sacred, there is something “eerie,” i.e., alien, in which we are not quite familiar and at home. What is sacred to me is not my own, and if the property of others, for example, were not sacred to me, I would look upon it as mine and would take it for myself when a good opportunity arose...
[...] You are not to me, and I am not to you, a higher essence. Nonetheless, a higher essence may be stuck in each of us, and call forth a mutual reverence. To immediately take the most general, the human being lives in you and me. If I didn’t see the human being in you, what reason would I have to respect you?
To be sure, you aren’t the human being in his true and suitable figure, but only a mortal husk of his, from which he can withdraw without coming to an end; but still for now this general and higher essence dwells in you, and, since an imperishable spirit has assumed a perishable body in you, so that your figure is actually only an “assumed one,” you bring to my mind a spirit that appears, appears in you, without being bound to your body and to this particular mode of appearance, thus a phantasm. This is why I don’t look at you as a higher essence, but rather only respect that higher being that “haunts” you; I “respect the human being in you.”
[...] But it is not only the human being, but everything, that “haunts.” The higher essence, the spirit, that haunts everything, is at the same time bound to nothing, and only—“appears” in it. A ghost in every corner!
[...] When the worldly egoist had shaken off one higher power, such as the Old Testament, the Roman Pope, etc., then immediately there was one seven times higher over him again, such as faith in place of the law, the transformation of all laypeople into priests in place of the limited body of clergy, etc. He was like the possessed man whom seven devils entered when he thought he had freed himself of one.
[...] Communism, which assumes that human beings “have equal rights by nature,” refutes its own propositions to the point that human beings have no rights at all by nature. Because it doesn’t want to recognize, for example, that parents have rights “by nature” against their children or the children against their parents; it abolishes the family. Nature gives parents, siblings, etc., no rights at all.
Anyway, this whole revolutionary or Babouvist principle rests on a religious, i.e., false viewpoint. Who can ask for “rights” if he is not himself coming from a religious standpoint? Isn’t “the right” a religious concept, i.e., something sacred? “Equality of rights,” as the revolution put it forward, is only another form of “Christian equality,” the “equality of brethren, of God’s children, of Christians, etc.”; in short, fraternité.
[...] When the revolution stamped equality as a “right,” it fled into the religious sphere, the region of the sacred, of the ideal. Thus, since then, the fight for “sacred, inalienable human rights.” Against “eternal human rights” the “well-earned rights of the existing order” are asserted quite naturally and with equal right: right against right, where of course one is denounced by the other as “wrong.” This has been the contest of rights since the revolution.... --The Unique and Its Property