The speaker notices ships in the third stanza. But is he disturbed by them? How do you know whether he is disturbed or not?

I don't think he is ships returning to port rather than they remind him of someone he lost. The ships seem content with a destination. But the mounded grave is no pleasant haven, in contrast. That end means the end of activity; there is no more hand to touch, no more voice to hear. Again the speaker is caught up in his internal thoughts, his memory of the mourned figure overshadowing what the speaker sees around him. The critic H. Sopher also interprets the contrast in this stanza as such: “The stateliness of the ships contrasts with the poet’s emotional imbalance; and the ships move forward to an attainable goal ... while the poet looks back to a ‘vanish’d hand’ and a ‘voice that is still.’”