To spare the candle must necessarily mean to go without light. It would be sinful to cover up a burning light. Rob a burning candle of the air it needs to give light, and it goes out. Light is characteristic of the people of Jesus in its total brightness and warmth. The old life, consumed, turns into life-giving strength.
Shameful things can live only in the dark.
Brightness leads to clarity and frankness, simplicity and purity, genuineness and truth. Where Jesus' influence makes people real, their life becomes genuine and pure. It shines into the darkness of the world around, unmasking everything that is spurious and untrue, everything that tries to hide. The light Jesus kindles is never exhausted in making a situation clear. Cold light has no part in the kingdom of God.