It is also very ancient. The Caesarean text-type shares common features with the texts used by Origen while he was in Caesarea. Its readings are quite diverse in their affinities with other text-types. The Alexandrian text-type derives from scholarly circles in ancient Alexandria and can be traced to the second century. Second, there is internal evidence .
Internal evidence has to do with the intrinsic likelihood of the various readings.
The more difficult reading is to be preferred. Scribes are more likely to smooth things out than to rough them up. The shorter reading is to be preferred. Scribes tend to add rather than subtract material. When some readings parallel other biblical texts, the divergent reading is to be preferred.