An angel said to Joseph, “Do not be afraid to take Mary as your wife. It is through the Holy Spirit that this child has been conceived”, and so he did.
And, how simple it all seems, but we know better. Both Mary and Joseph consented to requests steeped in mystery, because they trusted in their God.
Lord God, who indeed is this man, Joseph? We have no words to recall, but only his actions. Joseph was simply just there, present to whatever the Lord asked of him.