Service begins with separation from the world

Rom 7:6  But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not in the oldness of the letter.

Service begins with separation from the world, emancipation from the
kingdom of this world, but it is a very thoroughgoing thing. Oh, that
the church would recognize this, that God's last word about this
matter of emancipation and separation is “/there shall not a hoof be
left behind/” (Ex. 10:26). You see, Moses' service was a very
thoroughgoing service, and it went that far, that not a hoof was left
behind, and that is service to God. "See that the people are utterly
out, and there is no link remaining."

Do remember that service is always governed by this: a deep inward
separation. It is not enough for us to come out from the world and
become parts of the people of God. Something more than that is
necessary. The whole self-life in us has got to be definitely dealt
with, and a great separation has to take place there. The impulsive,
hot, fiery Moses has to become the quiet, patient, meek Moses...
learning, perhaps above all things, meekness and patience.

 What a discipline of those forty years of self-emptying. Presently when he
really enters upon his life's work, his life service, one of the
things that he will need most will be patience, and there is nothing
more calculated to produce patience than the discipline of inaction.
We do not learn patience when we can keep busy, when we can gratify
all our impulses by doing something. But when we are not allowed to do
anything, when we are cut off from ministry and work and service, and
shut up to the discipline of inaction and the discipline of delay, God
is preparing for better service than we would ever have fulfilled

By T. Austin-Sparks from: The Cross and the Way of Life - Chapter 7