Oh, how great is Your goodness, which you have laid up for those who fear You, Which You have prepared for those who trust in You in the presence of the sons of men! Psalm 31:19.
Great, rab; Strong’s #7227. Great, abundant, many, large in number; of major importance; chief, weighty, significant, noble, princely. This word comes about from the verb rabab, “to become numerous or great.”
The title rabbi is a derivative of rab. Rabbi, is defined as “my teacher,” however, a more exact definition would be “my great one” (full of knowledge) or “my master” (great instructor).
This is why our Lord did not allow His followers to be called by this lofty title; He stressed that we can have one Rabbi, and that must be the Messiah only as expressed in Matthew 23:8. “But you, do not call be called ‘Rabbi’; for One is your teacher, the Christ, (anointed, translates to “Messiah”) and you are all brethren.”