Candles are a sacramental, that is to say, something that helps you. In this case, Candles are an aid to spirituality. That is to say, they represent or aid the sense of the Divine and the Holy in a Church.
Candles represent light. In all the Christian Churches of the Reformation, they say the Creed. In the Nicene Creed, they say,
- God from God, light from light, very God from very God;
God is light.
Candles remind you of this.