To illustrate the Holy Ghost (good to use when speaking at baptisms).....use a candle on a candle stick, a tall glass "hurricane" globe to place around the candle and candlestick, and a candle snuffer. The candle represents you. Lighting the candle represents your faith, baptism and membership in the church. (Note, i believe it is against church policy to light a flame in church.) The glass globe represents the Holy Ghost, which you receive after baptism for "your protection." Explain that when you remain worthy and have the Holy Ghost with (or around) you, it will "protect you" from the fierce winds of the world as well as the adversary, satan. Here, the candle snuffer represents satan. Meaning, he is there waiting to snuff out your candle (of your faith or church membership). Note that when you place the globe around the candle, the candle snuffer cannot reach the flame.