The faithful predestinated to eternal life, are the stones in the structure of this wall which shall continually be built up unto the world's end. And one stone is added to another, when masters in the Church teach and confirm and strengthen those who are put under them: and whosoever in Holy Church undertaketh painful labours from brotherly love, he as it were beareth up the weight of stones which have been placed above him. Those stones which are of larger size, and polished, or squared, and placed on the outside and at the angles of the building, are men of holier life than others, who by their merits and prayers retain weaker brethren in Holy Church. 10. The cement, without which there can be no stability of the walls, is made of lime, sand, and water. The lime is fervent charity, which joineth to itself the sand, that is, undertakings for the temporal welfare of our brethren: {18} because true charity taketh care of the widow and the aged, and the infant, and the infirm: and they who have it study to work with their hands, that they may possess wherewith to benefit them. Now the lime and the sand are bound together in the wall by an admixture of water. But water is an emblem of the Spirit. And as without cement the stones cannot cohere, so neither can men be built up in the heavenly Jerusalem without charity, which the Holy Ghost worketh in them. All the stones are polished and squared--that is, holy and pure, and are built by the hands of the Great Workman into an abiding place in the Church: whereof some are borne, and bear nothing, as the weaker members: some are both borne and bear, as those of moderate strength: and some bear, and are borne of none save Christ, the corner-stone, as they that are perfect. All are bound together by one spirit of charity, as though fastened with cement; and those living stones are knit together in the bond of peace. Christ was our wall in His conversation: and our outer wall in His Passion. 11. When the Jews were rebuilding the walls of Jerusalem, their enemies strove hard to let the works: so that 'they built with one hand, and held their weapons of war in the other.' And round us too do enemies gather, while we are building the walls of our Church: our own sins, or ungodly men, willing to hinder our success. Whence, while we build our walls, that is, while we add virtue to virtue, we must fight with the enemy, and grasp our weapons firmly: we must 'take the helmet of salvation, the shield of faith, the breastplate of righteousness: and for our sword the word of God,' [Footnote 138] that we may defend ourselves against them: and God's priest shall be unto us in Christ's stead, to teach us by his lessons, and defend us by his prayers. [Footnote 138: Eph. vi, 16, 17.] {19}