"The word for Crown is Keter (), and Abulafia notes that when these letters reversed, they spell karet (), which means "cut off." Thus, when an individual attempts to reach the highest level of the Crown, if he is not worthy, he can end up being "cut off" spiritually. Abulafia therefore warns in the strongest terms that one who attempts to enter these mysteries must be adequately prepared, and that one not enter unless he is thoroughly familiar with all the necessary introductions."