The speaker is addressing someone who used to be kind, thoughtful, and giving, a "thinker of tender thoughts" who added something good to the world. The first two lines are warm and almost tender, like a memory being held carefully. Then the poem turns. Cruelty arrives in the form of "assault and humiliation," "laughs and snares," and the person is changed, even "consumed." The title, "Mockery," suggests that ridicule was a big part of what wore them down.
What the speaker feels seems to be grief mixed with worry and a quiet kind of anger. The closing questions, "where did you go?" and "Did the world swallow you, too?", sound unanswered and a little helpless. The word "too" hints that the world has swallowed others as well, or perhaps the speaker themselves. The mood is sad and hushed, a lament for gentleness that doesn't survive being mocked. The short, plain lines make the loss feel even more direct.