A boy stands in shallow water beneath a dark sky, and everything about him feels emptied out. The sea has taken his parents, and the poem suggests it has also scarred his feet and taken his voice. What stands out is the way loss is described as a "gift." The scars are "jewels" given on his birthday, and loneliness is another present he never asked for. That bitter, ironic wording shows how unwanted and unfair his pain feels.
The most painful moment is the line he can't say aloud: he won't forgive the ocean, no matter how often it touches his feet. His anger is real, but he has no voice to release it. The closing lines answer this by saying that when the mouth's scream goes unheard, the eyes and soul begin to scream instead. So his silence isn't peaceful. It's full of grief.
The mood is quiet, bleak, and heavy, like a still night by the water where something terrible has already happened.