The songs we sing in our worship we should be singing with the spirit and understanding. It is an opportunity that we can teach and admonish one another. A mighty Fortress may be an old song, but this hymn presents God as a source of protection, like a strong castle, a MIghty Fortress. Do we think of God like he is our fortress?
It is true that there are many difficult passages of scripture found within the pages of God’s word, yet it was God’s plan to reveal himself and His will in such a way that men could understand it. The Bible was not given to us to simply be memorized and stated as mere facts without understanding its precepts.