The Ethiopian when asked if he understood what he was reading replied, “How can I unless someone explains it to me?” (Act 8:31). The parables were intriguing stories that had a deeper meaning, which Jesus clarified with His disciples (Mt 13:36ff). Mature believers explained the Christian faith more fully to a younger enthusiastic man who did not have all the facts (Act 18:24-28). As believers we are to be able to give a clear presentation of the gospel, an explanation for the hope we have in Christ (1 Pet 3:15).
All Bible teaching is elaborating or giving clarification to the Word of God, yet whatever we share with others from the Bible must be true to its principles, without introducing our own human ideas.