By it's very definition, the world seems to have lost the idea of the “holy.” When something is holy it is set-apart to God, it is sacred. There can be levels or degrees of sacredness. There may be things that are appropriate in church but not at the temple. The profane can’t tell the difference.
We can take the temple itself as a model. Solomon’s Temple displays the typical ascension imagery. Within the temple walls (salvation) there were three levels, the first outer court was outside, and it represented the telestial world, where we live today. Telestial ordinances were appropriate there, but only there. Then one would enter the “Holy Place” which represented the Terrestrial level, it was higher, and holier. Then there was the “Holy of Holies.” Or the Most Holy Place. Here only Celestial actions are permitted.
It is absolutely amazing how seemingly righteous people use the name of deity in not only in casual, but also in utterly profane discussions. Many feel fine about adding personage of deities to silly or vulgar jokes.
I am convinced that a lack of holiness is the reason many cannot grasp gospel concepts beyond an elementary level.
A true mystics prepares himself with a deep respect and fear of God, this is the beginning of wisdom.
“The fear of the LORD is the beginning of wisdom: and the knowledge of the holy is understanding.” [Prob. 9:10]
HERE IS A LATE ADDITION: " The fear of the LORD is the beginning of wisdom: a good understanding have all they that do his commandments: his praise endureth for ever." [Psalms 111:10