A right derived from custom acquires no immutability or immunity from the fact that the practices out of which it grew were ancient and barbarous.

Nevertheless inferences from experience are trustworthy and entirely sufficient for practical life, and the aim of the above skeptical deliverances was not to shake beliefonly a fool or a lunatic can doubt in earnest the immutability of naturebut only to make it clear that it is mere belief, and not, as hitherto held, demonstrative or factual knowledge.

The more we realise the immutability of our lot, the more grateful we become for our pains as well as for our delights.