The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

When he was once accustomed to it he never parted from it more, but dragged it after him wherever he went. If by any chance it was lost, the whole camp knew it by his howls and sometimes I had to send people to look for it when he had mislaid it on some forest excursion, so that he would stop his noise He slept on it always, coiled up into a little heap, and only relinquished it when I gave him permission to accompany me into the woods.
To be （） of the pillow.