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"What"  Ephesians 3:16
"The strong spirit of people sustains them in bodily pain or trouble..."  Proverbs 18:14 (Amplified Bible, Classic Edition, revised)
1.  Losing heart.  Ephesians 3:10-13
2.  Drawing near or drifting away.  Ephesians 3:14-15
3.  Inner strength.  Ephesians 3:16  page 978, 2 Corinthians 4:16