Recently I was addressing a group of young men who wanted to learn the Scriptures in greater depth. I was about to speak to them about the value of having and using great Bible resources. By resources I mean books and other physical and digital materials beyond the Bible itself which help illuminate and explain aspects of the Biblical text.
I asked the group of about 18 how many of them owned a Bible dictionary: one. How many owned a Bible commentary: two. How many owned or used Bible software: zero!
While I firmly believe the Bible alone is sufficient to teach us all we need to know in order to be saved and pleasing to God, that is not the same as saying we do not need anything else to understand (and teach) it better!