Candles made a relevant object lesson because they commonly illuminated homes and churches. Spurgeon presents many different kinds of candles, their accessories, their history and their uses, and teaches a corresponding spiritual lesson. Some examples include: "Grace is like the light of a candle helping those around it," "Bibles which are never read are like lanterns which are never turned on," and "Always put the weaker brother in the place of honor if you can, and thus make the best use of his light." This book is richly illustrated to help explain the concepts.