Leonard Nimoy said this quote

The BlessingHeads are covered by the Tallit, or prayer shawl; hands are extended out with the fingers splayed to form the shape of the letter Shin, the first letter in the word Shaddai, a name for the Almighty. The chant, in Hebrew, is loud and ecstatic: May the Lord bless and keep you.The Shekhina is summoned; the feminine essence of God. She enters the sanctuary to bless the congregation. The very sight of her, the awesome light emanating from the Shekhina, is dangerous to behold.