The matter, or subject of a Covenant, is alwayes something that falleth under deliberation; (For to Covenant, is an act of the Will; that is to say an act, and the last act, of deliberation;) and is therefore alwayes understood to be something to come; and which is judged Possible for him that Covenanteth, to performe.

And therefore, to promise that which is known to be Impossible, is no Covenant. But if that prove impossible afterwards, which before was thought possible, the Covenant is valid, and bindeth, (though not to the thing it selfe,) yet to the value; or, if that also be impossible, to the unfeigned endeavour of performing as much as is possible; for to more no man can be obliged.