We can forgive the early Christian when he speaks of the love for the neighbor, because he was quite aware that he did not hate himself. He was taught that he loved himself and he knew it very well.
He was aware of the primitive egotism and therefore he was aware of the fact that it was a merit to love the neighbor; he made a merit of it in order to compensate his absolutely naïve selfishness, the naïve love for himself.
Then later on, it was discovered what a cunning loophole that love for the neighbor could be; when things are getting hot for yourself, disagreeable, then you simply love the neighbor and forget all about yourself. ~Jung, Zarathustra Seminar, Page 700