is no subject of dispute.

74. Whatever definition we may give of liberty, we should be careful to
observe two requisite circumstances; _first,_ that it be consistent with
plain matter of fact; _secondly,_ that it be consistent with itself. If
we observe these circumstances, and render our definition intelligible,
I am persuaded that all mankind will be found of one opinion with
regard to it.

It is universally allowed that nothing exists without a cause of its
existence, and that chance, when strictly examined, is a mere negative
word, and means not any real power which has anywhere a being in nature.
But it is pretended that some causes are necessary, some not necessary.
Here then is the advantage of definitions. Let any one _define_ a cause,
without comprehending, as a part of the definition, a _necessary
connexion_ with its effect; and let him show distinctly the origin of
the idea, expressed by the definition; and I shall readily give up the
whole controversy. But if the foregoing explication of the matter be
received, this must be absolutely impracticable. Had not objects a
regular conjunction with each other, we should never have entertained
any notion of cause and effect; and this regular conjunction produces
that inference of the understanding, which is the only connexion, that
we can have any comprehension of. Whoever attempts a definition of
cause, exclusive of these circumstances, will be obliged either to
employ unintelligible terms or such as are synonymous to the term which
he endeavours to define.[18] And if the definition above mentioned be
admitted; liberty, when opposed to necessity, not to constraint, is the
same thing with chance; which is universally allowed to have no
existence.