How can Jesus be both the Good Shepherd and the Lamb of God? How can we be His flock, as well as His house guests?
Well, mostly because they’re metaphors, which apply differently in different situations. You’re not meant to take everything in the Bible literally.
Reading 1
Acts 2:14a, 36-41
Then Peter stood up with the Eleven, raised his voice, and proclaimed: "Let the whole house of Israel know for certain that God has made both Lord and Christ, this Jesus whom you crucified."
Now when they heard this, they were cut to the heart, and they asked Peter and the other apostles, "What are we to do, my brothers?"
Peter said to them, "Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit. For the promise is made to you and to your children and to all those far off, whomever the Lord our God will call."
He testified with many other arguments, and was exhorting them, "Save yourselves from this corrupt generation." Those who accepted his message were baptized, and about three thousand persons were added that day.
The Church holds that Jews do not hold a special guilt for the death of Christ. After all, Jesus himself, the blessed mother, and all of the apostles were good and faithful Jews. Jesus died for all of our sins.1
On the the other hand, if you were in the crowd in Jerusalem during Holy Week, I don’t think it’s unreasonable to say you have some particular guilt, gentile or Jew.
So it’s good that they were there to hear Peter, and that he was filled with Holy Spirit enough to convince them to repent and be baptized. Not everyone days.
Those of us who have already been baptized still need to repent, though. Because, like I said, Christ died for our sins, too, whether we were there or not.
Responsorial Psalm
Ps 23: 1-3a, 3b4, 5, 6
R. The Lord is my shepherd; there is nothing I shall want.
The LORD is my shepherd; I shall not want.
In verdant pastures he gives me repose;
beside restful waters he leads me;
he refreshes my soul.
R. The Lord is my shepherd; there is nothing I shall want.
He guides me in right paths
for his name's sake.
Even though I walk in the dark valley
I fear no evil; for you are at my side.
With your rod and your staff
that give me courage.
R. The Lord is my shepherd; there is nothing I shall want.
You spread the table before me
in the sight of my foes;
you anoint my head with oil;
my cup overflows.
R. The Lord is my shepherd; there is nothing I shall want.
Only goodness and kindness follow me
all the days of my life;
and I shall dwell in the house of the LORD
for years to come.
R. The Lord is my shepherd; there is nothing I shall want.
The psalm is in two parts—in the first, we are God’s pet, a sheep. In the second, we’ve been upgraded to guest. God is taking care of us either way, but wouldn’t you rather be the latter?
Maybe, but consider the second reading…
Reading 2
1 Pt 2:20b-25
Beloved: If you are patient when you suffer for doing what is good, this is a grace before God. For to this you have been called, because Christ also suffered for you, leaving you an example that you should follow in his footsteps. He committed no sin, and no deceit was found in his mouth.
When he was insulted, he returned no insult; when he suffered, he did not threaten; instead, he handed himself over to the one who judges justly. He himself bore our sins in his body upon the cross, so that, free from sin, we might live for righteousness. By his wounds you have been healed. For you had gone astray like sheep, but you have now returned to the shepherd and guardian of your souls.
While Jesus is often called the Good Shepherd, he’s also the Lamb of God. Remember, that’s not because He’s docile (although He is, towards God’s will), but because He’s the sacrifice made on our behalf.
So when we are His “sheep,” we really are following in His footsteps. We do that by following His example in the Way of the Cross. He took up His cross, bore His suffering for the good of others.
We, His sheep, are to do the same. And then, maybe, we’ll be guests in His house forever.
Alleluia
Jn 10:14
R. Alleluia, alleluia.
I am the good shepherd, says the Lord;
I know my sheep, and mine know me.
R. Alleluia, alleluia.
Those who belong to Jesus must know Him. If you don’t know Him, how can you belong to Him?
Gospel
Jn 10:1-10
Jesus said: "Amen, amen, I say to you, whoever does not enter a sheepfold through the gate but climbs over elsewhere is a thief and a robber. But whoever enters through the gate is the shepherd of the sheep. The gatekeeper opens it for him, and the sheep hear his voice, as the shepherd calls his own sheep by name and leads them out. When he has driven out all his own, he walks ahead of them, and the sheep follow him, because they recognize his voice. But they will not follow a stranger; they will run away from him, because they do not recognize the voice of strangers."
Although Jesus used this figure of speech, the Pharisees did not realize what he was trying to tell them. So Jesus said again, "Amen, amen, I say to you, I am the gate for the sheep. All who came before me are thieves and robbers, but the sheep did not listen to them. I am the gate. Whoever enters through me will be saved, and will come in and go out and find pasture. A thief comes only to steal and slaughter and destroy; I came so that they might have life and have it more abundantly."
Just before this, Jesus cured a blind man. The Pharisees are unsure if this means Jesus is from God or the Devil. The reason Jesus uses this metaphor now is to illustrate how blind and ignorant the Pharisees are, that they don’t even recognize the Good Shepherd they’ve been waiting for.
Obviously, we should aspire to be the sheep in this instance. But it’s a cautionary tale—don’t follow the voice of one who isn’t Christ. How can you know the difference? That is, I think, the challenge of being Christian.
Except Mary, obviously.