In Jeremiah 31:3, God says, "I have loved you with an everlasting love."
It has already been happening. "I have loved you," He says.
You! Specifically, personally, uniquely you. (And me.)
Before we knew Him, with all our failings included, the Infinite Father God of All Creation looked down through time and said, "That girl, right there. I love her." Or "That guy, right there. I love him."