But as it is written, To whom he was not spoken of, they shall see: and they that have not heard shall understand.

ROMANS 15:21KJV
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What does Romans 15:21 mean?

Romans 15:21 explains why Paul brings the message about Jesus to people who have not heard it before. He sees his work reflected in an earlier passage of Scripture: people who had received no report about him would come to see and understand.

Paul introduces the quotation with “as it is written.” The words come from Isaiah 52:15, where the surprise of kings is described in connection with God’s servant. After explaining his aim in verse 20, Paul uses these words to show why reaching unfamiliar listeners matters to his work.

The Greek behind Romans 15:21

  • “spoken” — ἀναγγέλλω (anangellō): This word carries the sense of reporting or announcing news. Here it points to a report about someone, not merely a passing mention.
  • “understand” — συνίημι (syniēmi): This word can mean to grasp or comprehend. It gives the second half of the verse a focus on understanding what has been heard.

Why Romans 15:21 matters

  • Paul connects his work to Israel’s Scriptures. By quoting Isaiah 52:15, he presents the response of new listeners as something those writings had already described.

  • The verse points to a response, not just an audience. “They shall see” and “shall understand” describe what happens among those who had previously received no report.

  • Paul’s concern is to reach places where Jesus is not yet known. In verse 20, he says he aims to preach where Christ had not been named, rather than build on another person’s foundation.

Where else these words appear

“was” Greek G312 · used in 18 verses

  • Mark 5:14 And they that fed the swine fled, and told it in the city, and in the country. And they went out to see what it was that was done.
  • John 16:14 He shall glorify me: for he shall receive of mine, and shall shew it unto you.
  • Acts 19:18 And many that believed came, and confessed, and shewed their deeds.

“understand” Greek G4920 · used in 25 verses

  • Matthew 13:13 Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand.
  • Matthew 17:13 Then the disciples understood that he spake unto them of John the Baptist.
  • Luke 18:34 And they understood none of these things: and this saying was hid from them, neither knew they the things which were spoken.

“see” Greek G3700 · used in 57 verses

  • Matthew 5:8 Blessed are the pure in heart: for they shall see God.
  • Luke 22:43 And there appeared an angel unto him from heaven, strengthening him.
  • Acts 13:31 And he was seen many days of them which came up with him from Galilee to Jerusalem, who are his witnesses unto the people.