Matthew 17:19
Douay-Rheims
Jesus said to them: Because of your unbelief. For, amen I say to you, if you have faith as a grain of mustard seed, you shall say to this mountain, Remove from hence hither, and it shall remove; and nothing shall be impossible to you.
Gregory the Great
(Mor. pref. c. 2.) The mustard-seed, unless it be bruised, does not give out its qualities, so if persecution fall upon a holy man, straightway what had seemed weak and contemptible in him is roused into the heat and fervour of virtue.
Source details
A.D. 604 · as excerpted in the Catena Aurea on Matthew 17:19-21
Imported from an open dataset — not yet checked against the printed edition.