"Sanctuary" is the holiness of the Wisdom of God's Will, the truth of His unified, unchanging, wholesome Laws, sacred, eternal Commandments for the enlightenment of peoples, for their attainment of a sinless, righteous life leading to Eternal Life.
"Sacredness" is that which is especially honored by man, that which is truly valuable, that which separates him from sin, reveals the meaning of his life, that which leads man to true thinking and a godly, sinless way of life, to the inner and outer state of "holiness" - that which spiritualizes and makes a carnal man a spiritual man, i.e. gives him the spiritual "Image" and "Likeness" of God.
"Holiness" is a spiritual and moral category of everything that forms the basis of the true conduct of God's Laws of true Life, which exist regardless of man's acceptance or denial of them.
Translated with DeepL.com (free version)