Can you trace the gospel to the heart of God? If not, you have not reached the source. Is the cross the source of blessing? No, the cross stands a long way down the story. If you had not the love of God, you could never have had the cross of Christ. The blood is your only title to blessing. But how did you get the blood?
"God so loved the world, that He gave His only begotten Son, that whosoever believeth in Him should not perish, but have everlasting life." John 3:16. Your response to the gospel should be, "Out of Thine own heart Thou didst it. Thy bosom was the birthplace of this grace, the birthplace of all blessing."