God could not express greater love than he has expressed in giving the Son of his bosom to this world

“Nature and revelation alike testify of God's love. Our  Father in heaven is the source of life, of wisdom, and  of joy.”  Steps to Christ p. 9

“The Lord God of heaven collected all the riches of the  universe, and laid them down in order to purchase the  pearl of lost humanity. The Father gave all his divine  resources into the hands of Christ in order that the  richest blessings of heaven might be poured out upon  a fallen race. God could not express greater love than  he has expressed in giving the Son of his bosom to  this world. This gift was given to man to convince him that  God had left nothing undone that he could do, that  there is nothing held in reserve, but that all heaven  has been poured out in one vast gift.” Youth’s  Instructor, October 17, 1895.

And that greatest gift is the Son of His bosom,  Jesus.