John 3:16 For God so loved the world that He gave His only begotten Son, that everyone who believes into Him would not perish, but would have eternal life.
This verse shows God's love toward man. However, love in the Father cannot produce any effect; man can neither receive it, nor can he be saved by it. Although the love in the Father is rich, this rich love in the Father cannot save man nor cause man to have life. Therefore, it would not be enough if God's love toward man would remainly only in the Father. This love had to be manifested in the Son. At a certain point in time the love in the Father was manifested in the Son. As a result, man could receive the life of God and be saved.
God's love can be manifested in the Son because it progresses from the Father to the Son. When the divine love is manifested, it causes man not to perish. As it continues to be manifested, man receives eternal life, the very life of God. In other words, the divine life enters into man and becomes man's life.
- "the Fullness of God" PP 35-36