Only Once in sacred Scripture is an attribute of God elevated to the third degree. Only once is a characteristic of God mentioned three times in succession. The Bible says that God is holy, holy, holy. Not that He is merely holy, or even holy, holy. He is holy, holy holy. The Bible never says that God is love, love, love; or even mercy, mercy, mercy; or wrath, wrath, wrath; or justice, justice, justice. It says that He is holy, holy, holy, that the whole earth is full of His glory.
– R.C. Sproul, The Holiness of God, Tyndale House Publishers, Carol Stream, Ill., Copyright 1985, Kindle Edition