'Lord' in the Bible

Grace to you and peace from God the Father and our Lord Jesus Christ,

But I say that as long as the son is a child, he is in no way different from a servant, though he is lord of all;

I am certain about you in the Lord, that you will be of no other mind; but he who is troubling you will have his punishment, whoever he is.

But far be it from me to have glory in anything, but only in the cross of our Lord Jesus Christ, through which this world has come to an end on the cross for me, and I for it.

The grace of our Lord Jesus Christ be with your spirit, brothers. So be it.