Matthew 9:3

And behold, certain of the scribes said within themselves, This man blasphemeth.

The thinking of the scribes that only God could forgive sins was altogether correct. Moreover, if Christ was not God, as he claimed to be, they were correct in attributing blasphemy to Jesus. Christ himself accepted both these assumptions and demonstrated his divinity in the miracle that followed. The Scriptures relate in this place what the scribes said "within themselves!" This is one thing which no other literature except the Bible can relate, that is, what people say "within themselves."