Textual criticism of the New Testament is the identification of textual variants. or different versions of the New Testament, whose goals include identification of transcription errors, analysis of versions, and attempts to reconstruct the original text.
The chief characteristic of Western readings is fondness for paraphrase. Words, clauses, and even whole sentences are freely changed, omitted, or inserted. Sometimes the motive appears to have been harmonization, while at other times it was the enrichment of the narrative by the inclusion of traditional or apocryphal material. (Bruce M. Metzger)