Which lines from the excerpt directly develop the idea that things are a burden?
"I sat before the flickering embers of the open fire, and looked out through the open door to the sea When I was very tired, I chanced to go away to a little house by the sea There was nothing in the house to demand care, to claim attention, to cumber my consciousness with its insistent, unchanging companionship And so I rested. While the spell was still unbroken, I came away. For broken it would have been, I know, had I not fled first."
When the lines that directly develop the idea that things are burdens are:
I was very tired, I chanced to go away to a little house by the sea.
When There was nothing in the house to demand care, and to claim attention, Also to cumber my consciousness with its insistent, unchanging companionship.
In Morris's word phrases the choice is clear: tired, demand care, claim attention, cumber one's consciousness, insistent and unchanging companionship. Just Things are a burden.