"Glimpse" is about hope that flickers rather than shines steadily. The speaker sometimes catches sight of a light, which stands for a future of freedom and happiness. They admit it is still far away, but for now even a small glimpse is enough to lean on.
The second half is darker. On days when the light disappears, the speaker struggles to picture it at all, and even starts to doubt it was ever real, wondering if it was just a trick of the mind. That doubt is the heart of the poem. Those days force a choice: keep going or not. The repeated "Do I?" sounds hesitant and tired, as if the speaker is truly weighing the question.
The mood is quiet, honest and vulnerable. Then the poem turns outward with its last line, "What keeps you going?", and speaks directly to the reader. It feels less like a statement and more like an invitation to share what holds us up.