The materials contained in these courses are based entirely on the Bible. A good study of God's Word is the most profitable study in a person's life. The more you study, the more you want to study. A study of the Bible will make a person wise about salvation. And from a child thou hast known the Holy Scriptures.
Spiritual life depends on the Bible.
We don't have anyone else to go to for life when we turn from God. The soul that does not know the Bible is lost and headed for punishment. A study of the Bible will reveal God's will for man. It is by studying the Bible that we can learn what His will is for us. We need to study the Bible so that we will know how to pray.