Now, this, it seems to me, is intended, or at least may justifiably be used, for a type of the work which God's people have to carry on in the name of Jesus, and in the power of his Spirit, in the world. We have to build the wall of the church for God, but we cannot build it, for there is so much rubbish in our way. This is true, first, of the building of the church, which is the Jerusalem of God; and this is equally true of the temple of God, which is to be built in each one of our hearts. Full often we feel discouraged. Though we hear the voice that saith, But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost, keep yourselves in the love of God, still we are apt to feel that we cannot build this wall, because there is so much rubbish.