Candles are a great metaphor for the human soul.
Consider until very recently historically speaking candles really were an offering of light…especially for those services which were observed at night or in the wee hours of the morning. Each candle was not some symbolic token, but an actual offering of light. The more gathered to worship, the greater the light. So it is with us.
As noted above the body of the candle is transformed into light just as the human soul is transformed and transfigured in Christ our God, the Light of the world.
As it burns, the candle warmed by the heat becomes softer and more pliable as do we in earnest prayer.
When undisturbed in it's "prayer" the flame is simple, calm, steady, and fragrant…as we should be.
When disturbed, the flame flickers, burns unevenly, smokes, and weeps…as do we.
And when it's course is done the fire completely consumes the candle. Every speck of it has been transformed into light…as should our lives at the end of our days.