Matt 23:8-12 NLT.
8 “Don’t let anyone call you ‘Rabbi,’ for you have only one teacher, and all of you are equal as brothers and sisters.9 And don’t address anyone here on earth as ‘Father,’ for only God in heaven is your spiritual Father. 10 And don’t let anyone call you ‘Teacher,’ for you have only one teacher, the Messiah. 11 The greatest among you must be a servant. 12 But those who exalt themselves will be humbled, and those who humble themselves will be exalted.
It is very clear from this teaching of our Lord Jesus that we are all equal under one Lordship of the Triune God in the Kingdom of Heaven. Though we may have different ministries and different offices bestowed to serve right now, we are to serve with this same attitude as Christ our Lord who came to serve and not to be served.
Yet it is sad how often the established Christendom tries to set one above another by addressing such titles which belong to God alone : Reverend, Father, Your Grace, Your Holiness, etc.