I would say that the best answer of the ones provided would be to compare Taha Hussein's desire for knowledge with the metaphor of the boundless ocean. The Stream of Daysis significant primarily for displaying how someone like Hussein had the odds stacked considerably against him. Born in to an economically challenged family with not that great of a chance for education as well as having suffered the loss of eyesight at a young age, there was not a primary outlet for such a boy to become a learned student of intellectual ideas and letters. Yet, after outgrowing the educational opportunities of the kottab, the boy is able to make his way to Cairo and engage in study that literally opened up a world to him that someone in his condition would not have otherwise experienced. The key element in this was the inability to relent when it came to the absorption and understanding of ideas. In this, I would say that his willingness to embrace the academic life and his desire to work at it without respite would move him closer to possessing a thirst for knowledge as boundless as an ocean. The other descriptors are more provincial and less likely to strike at the basic message coming out of Hussein's work and his life narrative.