While the Trinity was not an explicit focus of George MacDonald's writing, his thinking was in complete harmony with the best writers who emphasize the Trinitarian nature of God. Indeed, John's statement that God is love is only understandable in the context of the Trinity, that ours is a three-person God, Father, Son, and Holy Spirit united in an eternal dance of love. The Good News is that we are all invited to join in that dance--you, me, Donald Trump, Kim Jong-un, John Piper, everyone.
I've got quite a library of MacDonald's books, and am not all that easy to impress, but MacDonald and Sanderson are a marriage made in the third heaven, as St. Paul would surely affirm. Breathtakingly beautiful hardly begins to describe this edition of The Golden Key; Sanderson' black-and-white scratchboard illustrations have the haunting quality of one's profoundest dreams.