The Incarnation of the Christ in Jesus of Nazareth

We know that in normal cases the first and second septenaries of human life are important periods of development; a third period follows, from puberty (the fourteenth year) to the twenty-first year; another from the twenty-first to the twenty-eighth and again another from the twenty-eighth to the thirty-fifth year. These divisions of time are not, of course, to be taken so pedantically that they are thought to end exactly at the ages specified, but when the second dentition takes place an important transition in the development of the human being occurs, approximately at the close of the seventh year.