That is a true necessity: because we cannot conceive the one occurring without the other.

But we can quite well conceive the apple not falling on his nose; we can fancy it flying ardently through the air to hit some other nose, of which it had a more definite dislike.

We have always in our fairy tales kept this sharp distinction between the science of mental relations, in which there really are laws, and the science of physical facts, in which there are no laws, but only weird repetitions.

We believe in bodily miracles, but not in mental impossibilities.

We believe that a Bean-stalk climbed up to Heaven; but that does not at all confuse our convictions on the philosophical question of how many beans make five.
Here is the peculiar perfection of tone and truth in the nursery tales.
The man of science says, "Cut the stalk, and the apple will fall"; but he says it calmly, as if the one idea really led up to the other.