Debating the hypostatic union is really not for everyone, but what we all can agree on is that sometimes we forget that Jesus was fully human, head and heart. This feast, pointed to by (in what we do not consider irony) several mystics, reminds us of the fullness of God's plan for salvation. Jesus is God, but he is also one of us. He did not need to become human in order to understand our day-to-day sufferings and joys, but he did in order to show us that it is possible to bend the human will to the divine will without losing anything and gaining everything. That is simple enough for the simplest of believers. As Bonaventure reminds us, the Church is born from the side of the human Jesus.
Now if you are up to the debate...
You who have been redeemed, consider who it is who hangs on the cross for you, whose death gives life to the dead, whose passing is mourned by heaven and earth, while even the hard stones are split. Consider how great he is; consider what he is.
In order that the Church might be formed from the side of Christ as he slept on the cross, in order that the word of scripture might be fulfilled – ‘They shall look on him whom they have pierced’ – God’s providence decreed that one of the soldiers should open his sacred side with a spear, so that blood with water might flow out to pay the price of our salvation. This blood, which flowed from its source in the secret recesses of his heart, gave the sacraments of the Church power to confer the life of grace, and for those who already live in Christ was a draught of living water welling up to eternal life.
...O soul devoted to God, whoever you may be, run to this source of life and light with eager longing. And with the power of your inmost heart cry out to him: ‘O indescribable beauty of God most high! O pure radiance of everlasting light! O life that gives life to all life! O light that illuminates every light, and preserves in its undying splendor the myriad flames that have shone before the throne of your godhead from the dawn of time!
-- St Bonaventure, The Tree of Life
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