15 This is what the Sovereign LORD, the Holy One of Israel, says: “In repentance and rest is your salvation, in quietness and trust is your strength, but you would have none of it.

Read Isaiah 30:15 Using Other Translations

For thus saith the Lord GOD, the Holy One of Israel; In returning and rest shall ye be saved; in quietness and in confidence shall be your strength: and ye would not.
For thus said the Lord GOD, the Holy One of Israel, "In returning and rest you shall be saved; in quietness and in trust shall be your strength." But you were unwilling,
This is what the Sovereign LORD, the Holy One of Israel, says: “Only in returning to me and resting in me will you be saved. In quietness and confidence is your strength. But you would have none of it.