Perhaps we shall lose them, perhaps they will be obliterated, if we return to nothing in the dust. But so long as we are alive, we can no more bring ourselves to a state in which we shall not have known them than we can with regard to any material object, than we can, for example, doubt the luminosity of a lamp that has just been lighted, in view of the changed aspect of everything in the room, from which has vanished even the memory of the darkness.