Some People Take Exception the 4 Gospel Accounts Were Written in the Third Person

[Mar 10:32-34 RSV] 32 And they were on the road, going up to Jerusalem, and Jesus was walking ahead of them; and they were amazed, and those who followed were afraid. And taking the twelve again, he began to tell them what was to happen to him, 33 saying, "Behold, we are going up to Jerusalem; and the Son of man will be delivered to the chief priests and the scribes, and they will condemn him to death, and deliver him to the Gentiles; 34 and they will mock him, and spit upon him, and scourge him, and kill him; and after three days he will rise."

[Mar 10:45 KJV] 45 For even the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many.

This saying in Mark 10.45 combines allusions to the Son of Man of Daniel 7 and the Suffering Servant of Is. 53. These ways of understanding Jesus were rare, if not nonexistent, in the early church, and thus it is improbable that the church (instead of Jesus Himself) would have created this saying. In fact, a similar saying in 1 Tim. 2.5-6 is reworded in a much more Hellenistic style (Greek construction), highlighting the antiquity and Semetic background of Mark's version.

[1Ti 2:5-6 KJV] 5 For [there is] one God, and one mediator between God and men, the man Christ Jesus; 6 Who gave himself a ransom for all, to be testified in due time.

The cross was central to Jesus' messianic self-understanding.

[Mar 14:24 KJV] 24 And he said unto them, This is my blood of the new testament, which is shed for many.