What does Siddhartha say to show his self-realization? How does self-realization propel Siddhartha on his journey toward spiritual enlightenment?

Siddhartha, afraid that he has offended the Buddha, reiterates his confidence in the Buddha's holiness, but expresses his doubt that any teaching can ever provide the learner with the experience of Nirvana. And while Gotama's path may be appropriate for some, Siddhartha says that he must take his own path, lest self-deception overtake him and he admit to Nirvana before having actually attained it. The Buddha admonishes Siddhartha to beware his own cleverness then wishes him well on his path.