“To live is Christ” is only possible for you and me because Jesus Christ said, like Paul would 700 years later, “to die is gain.” His substitutionary death for us as our Suffering Servant has gained for him the love of his life. You. Me. His bride. And it has gained for us all that is his. His righteousness. His reward. His interceding grace. His life.
“To live is Christ” is to embrace the truth that we are the thief on the cross, we are the soldiers pounding the nails. But those two nails are the forgiveness and eternal life of Jesus Christ.