Because whom he foreknew, he also predestined to be of similar nature of the form of his Son, in order for him to be the firstborn son among many brothers.
Jesus says to her, Do not touch me, for I have not yet ascended to my Father. But go to my brothers, and say to them, I ascend to my Father and your Father, and my God and your God.
And after going quickly, tell his disciples, He was raised from the dead, and lo, he goes before you into Galilee. There ye will see him. Behold, I have told you.