The writer of Hebrews gives us a picture of Jesus' purpose in coming as a Man.
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 2:14-18 (ESV)
Jesus, unlike either God the Father or God the Holy Spirit, experienced all the frailties, difficulties, limitations and temptations that you and I face. As a result of His intimate identification with all the weaknesses intrinsic to humanity, He has compassion for us. That compassion motivated Him to take the punishment that properly belongs to us by suffering a brutal execution on the cross.
Had Jesus merely assumed human form like the fictional gods of Greek and Roman mythology sometimes did, His death would have been nothing more than an illusion. Consequently, it couldn't have provided any real atonement for sin. Thankfully, He shed human blood, and His bloodline went back through David all the way to Abraham so that no one could forensically dispute His Messianic claim.
I have decided to close with this weekend's hymn a day early so that, as we reflect on Jesus as a Man of sorrows, we might worship Him with newfound awe. What a Savior!