You have already been cleansed by the word that I have spoken to you. (Jn 15:3)
One finds this verse in the passage where Jesus speaks of the vine and the branches (John 15:1-8). These disciples of Jesus "have already been cleansed" because they live the word of Jesus, each one individually and together as a community.
The true vineyard is the community of those who adhere to Jesus, as the branches to the stump. Only he who remains united to Jesus, as the vine to the branches, belongs to the Father's vineyard. The disciple who follows Jesus is called, every day, to give his response to the Word, and in this way is grafted into Jesus. The Word of Jesus, accepted and lived, is like a seed of rebirth, like a germ of life, destined to grow incessantly in those who live it. An ever greater fidelity to the Word is the condition of every apostolic activity. The branch can have apostolic power only to the point that it is rooted in the Lord, bearing witness to Him in sorrows, trials and even death. This indwelling of Christ is a strong and courageous, manly and daily faithfulness. Because this fidelity of the disciple is guaranteed by the faithfulness of the Lord: "I in him."
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An Experience of Life:
Simone Weil, a Jewish converted to Christianity, looking one day at the tall and slender plants, with long and leafy branches, commented that these branches, flooded with sunlight, by way of the phenomenon of chlorophyll, transmitted the lifeblood to the whole plant and thus the roots branched deep into the earth. Concluding her paper, Simone Weil posed a question: "But the plants, then, where do they have their roots, in the earth or in heaven?". And she herself replied: "In Heaven". And she concluded: "So too we have our roots in heaven, and the more one is rooted in God, so much the more one becomes man and so much the more one enters into humanity and becomes companion to each man.”