חמישים שערי בינה -51- The 50 Gates of Understanding

The concept of service appears next to the name of God twice in the context of the Levites [Bnei Kehat, Moshe Rabbeinu] - Fear is the foundation, the beginning, and the root of God's service. Acronyms -שער - gate -" that's the gate to reach god "- "זה השער להשם " -- A corrected fear is a fear that is based on love, on separations from the beloved [God]