“Lord, now lettest thou thy servant depart in peace, according to thy word:”
Luke 2:29 — Greek Interlinear
Church Fathers on Luke 2:29
If we marvel to hear that a woman was healed by touching the hem of a garment, what must we think of Simeon, who received an Infant in his arms, and rejoiced seeing that the little one he carried was He who had come to let loose the captive! Knowing that no one could release him from the chains of the body with the hope of future life, but He whom he held in his arms. Therefore it is said, And he blessed God, saying, Lord, now let you your servant depart.
When he says Lord, he confesses that He is the very Lord of both life and death, and so acknowledges the Child whom he held in his arms to be God.
If you examine the words of the righteous, you will find that they all sorrow over this world and its mournful delay. Alas me! says David, that my habitation is prolonged.