Why the Incarnation?

10 For it was fitting that he, for whom and by whom all things exist, in bringing many sons to glory, should make the founder of their salvation perfect through suffering. 11 For he who sanctifies and those who are sanctified all have one source. That is why he is not ashamed to call them brothers, 12 saying,

“I will tell of your name to my brothers;
    in the midst of the congregation I will sing your praise.”

13 And again,

“I will put my trust in him.”

And again,

“Behold, I and the children God has given me.”

14 Since therefore the children share in flesh and blood, he himself likewise partook of the same things, that through death he might destroy the one who has the power of death, that is, the devil, 15 and deliver all those who through fear of death were subject to lifelong slavery. 16 For surely it is not angels that he helps, but he helps the offspring of Abraham. 17 Therefore he had to be made like his brothers in every respect, so that he might become a merciful and faithful high priest in the service of God, to make propitiation for the sins of the people. 18 For because he himself has suffered when tempted, he is able to help those who are being tempted. (Hebrews 2)

Why did Christ have to come, in the flesh, live this earthly life, then die for our sins? Here we have a few reasons. First, so He could fully understand our plight, as those living  with sin around us, knocking at our door every day. Secondly, so He could be the appropriate Substitute, who could make propitiation (payment) for our sins. Thirdly, and maybe something we can more fully comprehend and appreciate, so He could help us, so we would know He understands and knows what He is talking about, when He is telling us know when temptation comes our way.  He was "tempted in all ways like we are", as we will find out later. His help is practical, experienced, thoughtful, and trustworthy. He came to help us.