If we ask ourselves why
John XXIII considered it necessary to reform the existing Code, the answer can perhaps be found in the Code itself which was promulgated in the year 1917. But there exists also another answer and that is the decisive one, namely, that the reform of the Code of Canon Law appeared to be definitely desired and requested by the same Council which devoted such great attention to the Church.
As is obvious, when the revision of the Code was first announced, the Council was an event of the future. Moreover, the acts of its magisterium and especially its doctrine on the Church would be decided in the years 1962-1965; however, it is clear to everyone that
John XXIII’s intuition was very true, and with good reason it must be said that his decision was for the good of the Church in the long term.
Therefore, the new Code, which is promulgated today, necessarily required the previous work of the Council; and although it was announced together with the Ecumenical Council, nevertheless it follows it chronologically, because the work undertaken in its preparation, since it had to be based upon the Council, could not begin until after completion of the latter.
Turning our mind today to the beginning of this long journey, that is, to that January 25, 1959, and to
John XXIII himself who initiated the revision of the Code, I must recognize that this Code derives from one and the same intention, which is that of the renewal of the Christian life. From such an intention, in fact, the entire work of the Council drew its norms and its direction.