Because.
Matthew 14:30
Matthew 14:31
Matthew 17:17
Hebrews 3:19

If.
Matthew 21:21
Mark 11:23
Luke 17:6
1 Corinthians 12:9
1 Corinthians 13:2

a grain.
Matthew 13:31
Mark 4:31

nothing.
Mark 9:23
Luke 1:37
Luke 18:27

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