As the _Desire_ of being freed from Uneasiness is equal to the _Uneasiness_, and the _Pleasure_ of satisfying that Desire equal to the _Desire_, the _Pleasure_ thereby produc'd must necessarily be equal to the _Uneasiness_ or _Pain_ which produces it: of three Lines, _A_, _B_, and _C_, if _A_ is equal to _B_, and _B_ to _C_, _C_ must be equal to _A_. And as our _Uneasinesses_ are always remov'd by some Means or other, it follows that _Pleasure_ and _Pain_ are in their Nature inseparable: So many Degrees as one Scale of the Ballance descends, so many exactly the other ascends; and one cannot rise or fall without the Fall or Rise of the other: 'Tis impossible to taste of _Pleasure_, without feeling its preceding proportionate _Pain_; or to be sensible of _Pain_, without having its necessary Consequent _Pleasure_: The _highest Pleasure_ is only Consciousness of Freedom from the _deepest Pain_, and Pain is not Pain to us unless we ourselves are sensible of it. They go Hand in Hand; they cannot be divided. You have a View of the whole Argument in a few familiar Examples: The _Pain_ of Abstinence from Food, as it is greater or less, produces a greater or less _Desire_ of Eating, the Accomplishment of this _Desire_ produces a greater or less _Pleasure_ proportionate to it. The _Pain_ of Confinement causes the _Desire_ of Liberty, which accomplish'd, yields a _Pleasure_ equal to that _Pain_ of Confinement. The _Pain_ of Labour and Fatigue causes the _Pleasure_ of Rest, equal to that _Pain_. The _Pain_ of Absence from Friends, produces the _Pleasure_ of Meeting in exact proportion. _&c._ This is the _fixt Nature_ of Pleasure and Pain, and will always be found to be so by those who examine it. One of the most common Arguments for the future Existence of the Soul, is taken from the generally suppos'd Inequality of Pain and Pleasure in the present; and this, notwithstanding the Difficulty by outward Appearances to make a Judgment of another's Happiness, has been look'd upon as almost unanswerable: but since _Pain_ naturally and infallibly produces a _Pleasure_ in proportion to it, every individual Creature must, in any State of _Life_, have an equal Quantity of each, so that there is not, on that Account, any Occasion for a future Adjustment.