Shir ha-Shirim XXI Part Two: Sefirah 49
Rabbi Berechiah said: Israel said before God: Sovereign of the Universe , Because You bring light into the world Your name is magnified in the world. And what is the light? Redemption. For when You bring us light, many converts come and join us, as for instance, Yitro and Rachav. Yitro heard the news and came. Rachav heard the news and came.
Rabbi Chanina said: When God performed a miracle for Chananiah, Mishael, and Azariah, many heathens were converted, as it is written, “When he sees his children, the work of My hands, in the midst of him, they shall sanctify My name (Isaiah 29:23).” What comes next? “They also who err in spirit shall come to understanding.” (Shir Hashirim Rabbah 188.8.131.52)
The Light that is revealed on Shavuot is our opportunity to reflect that Light to the world so that others will see and come to God.