And Moses said unto the LORD, O my Lord, I am not eloquent, neither before, nor since you have spoken unto your servant: but I am slow of speech, and of a slow tongue.
All Commentaries on Exodus 4:10 Go To Exodus 4
Augustine of Hippo
AD 430
[Moses] believes that by God’s will he can suddenly become eloquent when he says, “or since the time you began to speak to your servant.” He shows that it could happen that one who was not eloquent the day before, or the day before that, could suddenly become eloquent, from the time when the Lord began to speak to him.