When we have a work to do and we know that God is on our side, it makes the work worth while. You may never have to stand prepared to fight and work while facing a visible enemy. But, we must stand as all times with the armour of God on, prepared to fight the enemy of our souls. Satan doesn't want the work of God to go ahead and He will do anything in His power to stop it.
Neither Nehemiah or any of the people undressed, except to wash their clothes until the work was completed. And completed it was. The wall was rebuilt despite all of the opposition.
If God calls you to do a work for Him and the enemy tries to do all he can to stop you, remember Nehemiah. When God is fighting for you, continue in the work, persevere and you will complete the work in victory.