"When the sound of Om reached Siddhartha's ears, his slumbering soul suddenly awakened and he recognized the folly of his action" (89).
"These were his possessions, his power [...] He had lost them [...] He had exchanged them for the most wretched things" (95).
I cannot fast or think like I used to be able to do :/
All I have is love and money
"Fed his body and neglected his soul [...] if this had not happened, this moment [...] and the tense moment when he had bent over the flowing water, ready to commit suicide" (98).
I must not commit suicide. That is a horrible thing to do
Siddhartha used Om when he was a Samana, before starting his journey to enlightenment. Furthermore, he is not an entirely new person yet, and still holds onto aspects of his past.
Siddhartha's self-realization during this quote was one of the challenges he had to overcome. In addition, Siddhartha had to do this all alone, without the help of anyone. The aspect of loneliness is a major part of the abyss in the Hero's Journey.
Siddhartha's greatest challenge during the abyss was not committing suicide. In order for him not to kill himself, Siddhartha had to realize that he could have stayed with Kamala or Kamaswami, but since he didn't, he had to keep moving on his journey.