Charles Spurgeon Commentary Luke 2:28-32

"then he received him into his arms, and blessed God, and said, Now lettest thou thy servant depart, Lord, According to thy word, in peace; For mine eyes have seen thy salvation, Which thou hast prepared before the face of all peoples; A light for revelation to the Gentiles, And the glory of thy people Israel." — Luke 2:28-32 (ASV)

And blessed God, and said, Lord, now lettest thou thy servant depart in peace, according to thy word: for mine eyes have seen thy salvation, which thou hast prepared before the face of all people; a light to lighten the Gentiles, and the glory of thy people Israel.

Simeon had studied the ancient prophecies to good purpose, and he perceived from them that the Lord's Christ would be a light to lighten the Gentiles as well as the glory of God's ancient people, Israel.