Final answer:
The set of lines that supports the idea that the speaker is understanding of the feelings of his fellow men is "But still I rejoice when the travelers rejoice, And weep with the strangers that moan." (lines 29-30)
Step-by-step explanation:
The set of lines from the poem that supports the idea that the speaker is understanding of the feelings of his fellow men is:
"But still I rejoice when the travelers rejoice,
And weep with the strangers that moan." (lines 29-30)
In these lines, the speaker expresses empathy and understanding towards the emotions of others. He rejoices when the travelers are happy and weeps with the strangers who are in pain or distress. This shows that the speaker is attuned to the feelings of his fellow men.