== Documentation Needed == 

 "Starting[citation needed] in the second century the nomina sacra were sometimes shortened by contraction in Christian inscriptions" 

 As this sentence reads, it suggests that in the first century there were Christian inscriptions that referred to Christ, God, Lord, Jesus, Spirit (in Greek) written out in full by Christians and that the nomina sacra abbreviations were only started in the 2nd century.  Should this statement be clarified to something like "The earliest Christian inscriptions come from the second century.  In those inscriptions the nomina sacra are already found."  And some documentation is needed.