The prophet Joel goaded his Jerusalem listeners: Be aware, the Day of the Lord is coming. Repent, return to the Lord. Be glad and rejoice in God. Joel told them that good times would replace the devastation they they had been experiencing. Then he said, "Everyone who calls on the name of the Lord shall be saved." For I will restore the fortunes of Judah and Jerusalem" (Joel 2:32).
Centuries later, Paul quotes this prophet, Romans 10:13.
Many have read this promise stated by Paul as an exclusionary statement. They assert that Paul is saying "Only those who believe that Jesus is Christ and Lord are included in God's promises." Others, influenced by verse 12, read Paul's remarks as inclusionary rather than exclusionary. "You, even you, are included. You don't have to be a Jew to be part of God's promises."
"God is generous to all who call on him," Paul says. Then, he lets us know what the consequences of this is. "How are they supposed to know this if someone doesn't bother to tell them?"