"When in 1954, as a Catholic priest, I went for the first time to India, my father's land, I saw that the great problem, mine too, was that of the relationship between "Hinduism and Christianity": this was the first title of the book that it was subtitled "The Unknown Christ of Hinduism". I remember it was my great friend Bede Griffiths who suggested that I reverse the title with the subtitle and I have always been grateful to him. I would also like to underline that the theme of the book has always been the central problem of my life, as the different dates of the various introductions to the different editions show. I repeat that the adjective "unknown" referring to Christ is also valid for historical Christianity. I have repeatedly suggested that the meeting of religions, indispensable today, implies a mutation in the self-understanding of religions itself and in this case of Christianity itself. After being historically anchored for almost two millennia to the monotheistic traditions originated by Abraham, Christianity must meditate on the "kenosis" of Christ and have the courage, as in the first Council of Jerusalem, to free itself from the Jewish tradition (whose symbol was circumcision) and from Roman traditions without breaking with them, allowing itself to be fertilized by the other traditions of humanity."