The two sets of lines in this excerpt from T.S. Eliot's "The Love Song of J. Alfred Prufrock that suggests that the speaker is concerned about how he relates to others are:
There will be time, there will be time
To prepare a face to meet the faces that you meet;
-(They will say: "How his hair is growing thin!")
My morning coat, my collar mounting firmly to the chin,
My necktie rich and modest, but asserted by a simple pin—
(They will say: "But how his arms and legs are thin!")
We can deduce the thoughts and opinions of an author from his choice of words. In these lines from the poem, we can see that the speaker is concerned about the way he relates with others.
In the first two lines above, he prepares his face to meet others while in the four lines above, he is concerned about how they see his physical appearance.
So, these two options suggest that the speaker is concerned about how he relates to others.
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