'Servants' in the Bible

who also makes us adequate [as] servants of a new covenant, not of the letter, but of the Spirit, for the letter kills, but the Spirit gives life.

but commending ourselves as servants of God in every [way], in much endurance, in afflictions, in distresses, in difficulties,

Therefore [it is] not a great thing if his servants also disguise themselves as servants of righteousness, whose end will be according to their deeds.

Are they servants of Christ?--I am speaking as though I were beside myself--I [am] more so, with far greater labors, with far more imprisonments, with beatings to a much greater degree, in [danger of] death many times.