Yes, the sentence is grammatically correct. The speaker is expressing a strong sense of faith and conviction that they will not accept a lesser outcome or situation in life because they believe that God has promised something better or more fulfilling.
Here are a few possible rephrasings:
1. "I refuse to settle. God has promised me greater things, and I trust in Him."
2. "I won't accept less than what I believe God has promised me."
3. "I’m


