“It is in our Lord’s prayer, when He is in the inner sanctuary speaking with the Father, that we have these words, ‘All mine are thine, and thine are mine.’ (John 17:10)
Here is the Son speaking to the Father, not about thrones and royalties, nor cherubim and seraphim, but about poor men and women, in those days mostly fishermen and peasant folk, who believed on Him.
They are talking about these people, and the Son is taking His own solace with the Father in their secret privacy by talking about these precious jewels, these dear ones that are their peculiar treasure.
You have not any notion how much God loves you.
Dear brother, dear sister, you have never yet had half an idea, or the tithe of an idea, of how precious you are to Christ.
You think, because you are so imperfect, and you fall so much below your own ideal, that, therefore, He does not love you much; you think that He cannot do so.
Have you ever measured the depth of Christ’s agony in Gethsemane, and of His death on Calvary? If you have tried to do so, you will be quite sure that, apart from anything in you or about you, He loves you with a love that passeth knowledge.
Believe it. ‘But I do not love Him as I should,’ I think, I hear you say. No, and you never will unless you first know His love to you.
Believe it; believe it to the highest degree, that He so loves you that, when there is no one who can commune with Him but the Father, even then their converse is about their mutual estimate of you, how much they love you: ‘All mine are thine, and thine are mine.'”
–Charles H. Spurgeon, “Christ’s Pastoral Prayer for His People,” in The Metropolitan Tabernacle Pulpit Sermons, Vol. 39 (London: Passmore & Alabaster, 1893), 39: 507–508. Spurgeon preached this sermon on John 17:9-10 on the Lord’s Day evening of September 1, 1889 at the Metropolitan Tabernacle.