I’m putting together some materials for a small group that will be studying 1 John. Here’s a wonderful quote from Augustine, found in the Ancient Christian Commentary on Scripture volume that includes the Johanine epistles:
This book is very sweet to every healthy Christian heart that savors the bread of God, and it should constantly be in the mind of God’s holy church. But I choose it more particularly because what it specially commends to us is love. The person who possesses the thing which he hears about in this epistle must rejoice when he hears it. His reading will be like oil to a flame. . . . For others, the epistle should be like flame set to firewood; if it was not already burning, the touch of the word may kindle it.