And the Heathen that believed, that Saturn was deposed by his son Jupiter, believed neverthelesse the same Jupiter to be the avenger of Injustice: Somewhat like to a piece of Law in Cokes Commentaries on Litleton; where he sayes, If the right Heire of the Crown be attainted of Treason; yet the Crown shall descend to him, and Eo Instante the Atteynder be voyd; From which instances a man will be very prone to inferre; that when the Heire apparent of a Kingdome, shall kill him that is in possession, though his father; you may call it Injustice, or by what other name you will; yet it can never be against Reason, seeing all the voluntary actions of men tend to the benefit of themselves; and those actions are most Reasonable, that conduce most to their ends.

This specious reasoning is nevertheless false.
For the question is not of promises mutuall, where there is no security of performance on either side; as when there is no Civill Power erected over the parties promising; for such promises are no Covenants: But either where one of the parties has performed already; or where there is a Power to make him performe; there is the question whether it be against reason, that is, against the benefit of the other to performe, or not.

And I say it is not against reason.

For the manifestation whereof, we are to consider; First, that when a man doth a thing, which notwithstanding any thing can be foreseen, and reckoned on, tendeth to his own destruction, howsoever some accident which he could not expect, arriving may turne it to his benefit; yet such events do not make it reasonably or wisely done.

Secondly, that in a condition of Warre, wherein every man to every man, for want of a common Power to keep them all in awe, is an Enemy, there is no man can hope by his own strength, or wit, to defend himselfe from destruction, without the help of Confederates; where every one expects the same defence by the Confederation, that any one else does: and therefore he which declares he thinks it reason to deceive those that help him, can in reason expect no other means of safety, than what can be had from his own single Power.