Carta is presented as someone who writes. Nowy "had agreed to be Garta's literary executor-Garta had asked him to do this, but with the unusual condition that everything be destroyed." Nowy "sensed the reason for that last wish. Garta was not announcing a new religion; he wanted only to live his faith. … He required the ultimate effort of himself; as he had not succeeded, his writings (mere rungs to help him climb to the heights) had no value for him."
Still, Nowy/Brod did not want to obey his friend's wish, because in his view, Carta's writings, "even as attempts, as mere sketches, bring to wandering humanity a presentiment of something irreplaceable."
Yes, it's all there.
3
Were it not for Brod, we would not even know Kafka's name today. Right after his friend's death, Brod saw to the publication of his three novels. No reaction. So he realized that, to establish Kafka's work, he would have to undertake a real and long war. Establishing a body of work means presenting it, interpreting it. Brod opened a veritable artillery attack: prefaces: for The Trial (1925), for The Castle (1926), for Amerika (1927), for "Description of a Struggle" (1936), for the diaries and letters (1937), for the stories (1946); for the Conversations by Gustav Janouch (1952); then the dramatizations: of The Castle (1953) and Amerika (1957); but above all, four important books of interpretation (take good note of the titles!): Franz Kafka: A Biography (1937), The Faith and Teachings of Franz Kafka (1946), Franz Kafka, He Who Shows the Way (1951), and Despair and Salvation in the Work of Franz Kafka (1959).
Through all of these texts, the image outlined in The Enchanted Kingdom of Love is confirmed and developed: above all, Kafka is primarily the religious thinker, der religiose Denker. True, he "never systematically set out his philosophy and his religious world view. Nonetheless, we can deduce rather clear fundamentals from his work, from his aphorisms especially but also from his poetry, his letters, his diaries, and then also from his way of life (from that above all)…"