In books lies the soul of the whole Past Time the articulate audible voice of the Past, when the body and material substance of it has altogether vanished like a dream. Thomas Carlyle
I do not deny the existence of material substance merely because I have no notion of it, but because the notion of it is inconsistent, or in other words, because it is repugnant that there should be a notion of it. George Berkeley
As a child, what captivated me was reading the poems myself and realizing that there was a world without material substance which was nevertheless as alive as any other. Mary Oliver