'Servant' in the Bible

for now men do I persuade, or God? or do I seek to please men? for if yet men I did please -- Christ's servant I should not be.

there is not here Jew or Greek, there is not here servant nor freeman, there is not here male and female, for all ye are one in Christ Jesus;

And I say, so long time as the heir is a babe, he differeth nothing from a servant -- being lord of all,

so that thou art no more a servant, but a son, and if a son, also an heir of God through Christ.