Arcanity

Whatever physician has not this element of fire in its arcanity—if I may coin that word—cannot boast that he is a true and tried physician.

Source: wiktionary

Arcanity, if there is such a noun, is not a deliberate concealment.

Source: wiktionary

Length, arcanity and just plain dullness of some of the festival fare of foreign films certainly provide some cerebral exercise for audiences.

Source: wiktionary

If thou’rt puzzled, go anywhere, / Seek priests or prophets, doctors for the brain, / I venture none of them can e’er explain / This love’s arcanity: like holy God / That’s three in one, ’t is more than something odd.

Source: wiktionary