The numerical value of Gevurah, 216, is 6 times 6 times 6. The tablets of the covenant that Moses received at Sinai were 6 by 6 by 6 handbreadths. The Torah was given to Moses and Israel from "the Mouth of the Gevurah." It is most significant that the name of no other sefirah is used by our sages to connote God Himself, other than gevurah (In the Bible, God is referred to as "the netzach [eternity] of Israel" (Samuel 1 15:29), but not as netzach alone). Here, gevurah implies God's essential power to contract and concentrate His infinite light and strength into the finite letters of Torah (especially those engraved on the tablets of the covenant, the Ten Commandments). Gevurah = 216 = 3 times 72 (chesed). Each of God's 72 hidden Names possesses three letters, in all--216 letters. Meaning inheres to words and names.