In what did Christ's humiliation consist?

Answer

Christ's humiliation consisted in His being born, and that in a low condition (), made under the law (), undergoing the miseries of this life (), the wrath of God (), and the cursed death of the cross (); in being buried, and continuing under the power of death for a time ().

Read the 6 proof texts (KJV)

Luke 2:7: And she brought forth her firstborn son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn.
Galatians 4:4: But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
Isaiah 53:3: He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were [our] faces from him; he was despised, and we esteemed him not.
Matthew 27:46: And about the ninth hour Jesus cried with a loud voice, saying, Eli, Eli, lama sabachthani? that is to say, My God, my God, why hast thou forsaken me?
Philippians 2:8: And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.
Matthew 12:40: For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth.