Is Dust immortal then, I ask'd him, so that we may see it blowing through the Centuries? But as Walter gave no Answer I jested with him further to break his Melancholy humour: What is Dust, Master Pyne?
And he reflected a little: It is particles of Matter, no doubt.
Then we are all Dust indeed, are we not?
And in a feigned Voice he murmered, For Dust thou art and shalt to Dust return. Then he made a Sour face, but only yo laugh the more.

Peter Ackroyd