Why? I don't know, but He does.

“For God so loved the world that he gave his only Son, so that everyone who believes in him may not perish but may have eternal life.'

John 3:16

 In order for Jesus to be conceived and born, 

a vessel of the greatest purity and holiness could be chosen by God to bear His Son for our salvation.

Mary,

who would become the  Mother of God,

was visited by an angel, 

"And he came to her and said, “Greetings, favored one! The Lord is with you.”

Of course she was confused.

How would you feel if an angel visited you tonight?

Would you be afraid or wondering what was happening?

I would be.

"But she was much perplexed by his words and pondered what sort of greeting this might be.  The angel said to her, “Do not be afraid, Mary, for you have found favor with God.  And now, you will conceive in your womb and bear a son, and you will name him Jesus. He will be great, and will be called the Son of the Most High, and the Lord God will give to him the throne of his ancestor David.  He will reign over the house of Jacob forever, and of his kingdom there will be no end.”  

 ^{Luke 1: 29-33}

^{Mary understood her heavenly visitor, but she was perplexed since she was a virgin.} 

^{She knew the facts of life and how babies came into being.}

^"Mary said to the angel, “How can this be, since I am a virgin?”

Luke 1: 34 

The ever patient angel replied to Mary.

The angel said to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be holy; he will be called Son of God. " 

Now, wouldn't that take your breath away!

You were just asked to be the Mother of our Living God!

I'm not sure I'd have words, and before Mary could reply, the angel gave her a job to do,

which, she took on with great faith.

"And now, your relative Elizabeth in her old age has also conceived a son; and this is the sixth month for her who was said to be barren.  For nothing will be impossible with God."   

Luke 1: 37

Mary had known her cousin as she was growing up.

She loved Elizabeth!  Elizabeth had never been able to have children, but upon hearing of Elizabeth's pregnancy in her advanced  age, Mary began to make plans to leave to care for her cousin.

And the angel waited upon Mary patiently for she had not given him and answer.

"Then Mary said, “Here am I, the servant of the Lord; let it be with me according to your word.” Then the angel departed from her."

The angel left so that God could do the work He intended to do.  

Mary then proceeded to the hill country to join her cousin Elizabeth.

God

so

Loved 

the 

World.   

Why?

I don't know.

We are grievous sinners who have removed God from our hearts and lives,

Yet,

God. So. Loved. the. World.