Through this feast day God reveals to us how the incarnation of the Word took place; He speaks to us of the mystery of the Most Holy Trinity, that is one God in three distinct Persons: “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy, the Son of God”.
God did not choose just any woman to be the Mother of His Son who, of course, could not assume a nature stained by sin. Therefore He made Mary immaculate from the first instant of her life, the moment of her conception; and she remained always a virgin. If Mary had not been full of grace and all holy, the Angel could not have said to her that she was full of grace, because she would have some stain of sin in her.
Through the merits of the Word made flesh, from whom we receive pardon and grace, we also, if we are fortunate enough to possess the gift of faith and to live a good life, are living temples of the adorable Trinity.
( Book “Calls from the Message of Fátima” by Sister Lucia, page 274, can be obtained through http://www.thecalltofatima.com/)