A Christian man is the most free lord of all, and subject to none;
a Christian man is the most dutiful servant of all, and subject to every one.
Although these statements appear contradictory, yet, when they are found to agree together, they will be highly serviceable to my purpose. They are both the statements of Paul himself, who says: “Though I be free from all men, yet have I made myself servant unto all,” and: “Owe no man anything, but to love one another.”
Now love is by its own nature dutiful and obedient to the beloved object. Thus even Christ, though Lord of all things, was yet made of a woman; made under the law; at once both free and a servant; at once both in the form of God and in the form of a servant.
–Martin Luther
Though you are a person who is free, have you placed yourself into a love relationship with God and others, choosing voluntary service to them?
You have told your spouse that you love her. Would she say that you serve her well?
You hug your children and tell them that you love them. Would they say that you serve them well?
You tell God that you love Him. Would He say that you serve Him well?
God told you that He loved you. Then He died on the cross for you. Jesus served you well with dutiful and obedient love! It is now my calling and your calling to go do the same for Him and for others.