So great are the advantages we reap from the incarnation of the Son of God that to contemplate it, and to thank and praise him for the same, ought to be the primary object of all our devotions and the employment of our whole lives. In the feast of the Conception of the Immaculate Virgin Mother of God we celebrate the joyful dawning of that bright day of mercy, the first appearance which that most glorious of all pure creatures made in the world, with those first seeds of grace which produced the most admirable fruit in her soul. Her conception was itself a glorious mystery, a great grace, and the first effect of her predestination. Her Divine Son, the eternal God, in the first moment of her being, considered the sublime dignity to which he had decreed to raise her, and remembered that august, dear, sacred, and venerable name of his mother, which she was one day to bear; and he beheld her with a complacency, and distinguished her in a manner, suitable to so near a relation she was to bear. He called her not his servant in whom he gloried, as he did Israel, but his mother, whom for the sake of his own glory he decreed exceedingly to exalt in grace and glory. From that instant the eternal Word of God, which was to take flesh of her, looked upon it as particularly incumbent on him, in the view of his future incarnation, to sanctify this virgin, to enrich her with his choicest gifts, and to heap upon her the most singular favours with a profusion worthy his omnipotence. From that very moment he prepared her to be his most holy tabernacle. When Almighty God commanded a temple to be built to his honour in Jerusalem, what preparations did he not ordain! What purity did he not require in the things that belonged to that work, even in the persons and materials that were employed in it! David, though a great saint, was excepted against by God, because he had been stained with blood spilt in just wars. Again, what purifications, consecrations, rites, and ceremonies did he not order to sanctify all the parts of the building! This for a material temple, in which the ark was to be placed, and men were to offer their homages and sacrifices to his adorable Majesty. What, then, did he not do for Mary in spiritually decking her, whose chaste womb was to be his living tabernacle, from whose pure flesh he was to derive his own most holy body, and of whom he would himself be born! source http://www.ewtn.com/saintsHoly/saints/I/immaculateconception.asp | 
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