It's hard work. There are obstacles and opposition to overcome. There are discouragements and doubts along the way. We see all of these drawbacks at work in the book of Nehemiah. But the great encouraging truth of the book of Nehemiah is that solid spiritual walls can be built and that God will bless every effort we make to persevere in spiritual wall-building.
Spiritual walls relate to the strength and stability of our Christian testimony.
They relate to our capability of defending the faith. They relate to our moral strength in time of temptation. They relate to our ability to separate from the unbiblical values and attitudes of this world's system. Think of a walled city compared with an unwalled city back in the days before modern warfare. The walled city was much stronger and more easily defended.