There was once a time when someone's arm served as my pillow, but now my head never lifts from resting upon my own knees.

This couplet draws a poignant contrast between the warmth of past intimacy and the cold weight of present loneliness. In days gone by, the lover's arm served as a comforting pillow, symbolizing tender security and belonging. Now, abandoned by love, the speaker sits huddled in grief, their head buried in their own knees in the timeless posture of despair.