The root idea of “holiness” is that of separation or “withdrawal.” … a quality best describes as “alienness” in a divine sense.
The first prayer I learned as a child was the simple table grace: "God is great, God is good, and we thank Him for this food." The two virtues assigned to God in this prayer, greatness and goodness, may be captured by the one biblical word, holy.
R.C. Sproul, Essential Truths
How little people know who think that holiness is dull. When one meets the real thing, it is irresistible.
C.S. Lewis, Letters to an American Lady