First, because faith is our light. Christ said: I am the light of the world. The light of the lamp reminds us of the light with which Christ illuminates our souls.
Second, to remind us of the light of the character of the saint before whom we light the candle. Because the saints are called: sons of light.
Thirdly, to serve as a rebuke for our dark deeds, and evil thoughts and desires, and to invite us to the path of gospel light. So that they would strive so zealously for the Saviour’s commandment: so that your vision shines before people, so that they see your good works.
Fourth, that it should be our small sacrifice to God, who sacrificed himself for us. One tiny sign of our great gratitude and bright love for Him, from whom we ask in prayer for life and health and salvation and all that only boundless heavenly love can give.
Fifth, that it scares the evil forces, which sometimes attack us during prayer and take our thoughts away from our Creator. Because the evil forces love darkness and reject all light, especially that which is meant for God and His people.
Sixth, to encourage us to burn ourselves out. Just as the oil and the wick burn in a lamp, submit to our will, so may our souls also burn with the flame of love in all sufferings, submit always to the will of God.
Seventh, to teach us that just as a candle cannot be lit without our hand, so our heart, that inner candle of ours, cannot be lit without the holy fire of God’s grace, even if it is filled with all virtues. Because all our virtues are like fuel, and from God is the fire that kindles them.
Eighth, to remind us that the Creator of the world first of all created light, and then everything else in order. And God said: let there be light. And there would be light. Thus, at the beginning of our spiritual life, the light of Christ’s truth must first shine within us. From that light of Christ’s truth, every good thing is created and sprouts and grows in us.
May the light of Christ illuminate you too.