Respuesta :
I believe that the sand in the poem symbolizes time. The fact that the sand is constantly slipping through the narrator's hands and his inability to 'grasp it with a tighter clasp' means that he is running out of time and that he is trying to keep it for himself, but is ultimately failing to do that. Time is running out on him and it is futile to try to chase after it.
Answer:
The sand in this poem symbolizes the narrator's dream.
Explanation:
The narrator is upset at the fact that he cannot keep a hold of the sand no matter how tight he holds on. The pitiless wave, washing away the sand, standing as an obstacle in the way of the narrator achieving his dream.