To be a Servant

In God's Kingdom things are the other way around.

But he that is greatest among you shall be your servant. And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.
- Matthew 23:11-12 (KJV)

Jesus was a servant.

Let this mind be in you, which was also in Christ Jesus: Who, being in the form of God, thought it not robbery to be equal with God: But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men.
- Philippians 2:5-7 (KJV)

A servant must meet certain character requirements.

And the servant of the Lord must not strive; but be gentle unto all men, apt to teach, patient, in meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth; and that they may recover themselves out of the snare of the devil, who are taken captive by him at his will.
- 2 Timothy 2:24-26 (KJV)

Being a servant of God is not an easy task.

But in all things approving ourselves as the ministers of God, in much patience, in afflictions, in necessities, in distresses, in stripes, in imprisonments, in tumults, in labours, in watchings, in fastings; by pureness, by knowledge, by long suffering, by kindness, by the Holy Ghost, by love unfeigned, by the word of truth, by the power of God, by the armour of righteousness on the right hand and on the left, by honour and dishonour, by evil report and good report: as deceivers, and yet true; as unknown, and yet well known; as dying, and, behold, we live; as chastened, and not killed; as sorrowful, yet alway rejoicing; as poor, yet making many rich; as having nothing, and yet possessing all things.
- 2 Corinthians 6:4-10 (KJV)

A servant must put God first.

If any man come to me, and hate not his father, and mother, and wife, and children, and brethren, and sisters, yea, and his own life also, he cannot be my disciple.
- Luke 14:26 (KJV)

It is not litereally hating those things. It just means that God must be first.

I have set the Lord always before me: because he is at my right hand, I shall not be moved.
- Psalms 16:8 (KJV)

And then God will call you His friend.

Henceforth I call you not servants; for the servant knoweth not what his lord doeth: but I have called you friends; for all things that I have heard of my Father I have made known unto you.
- John 15:15 (KJV)