promissive

— The promissive presumably belongs with informant subjects because we can assert a special kind of commitment concerning our own future actions; or, in a question, ask for this commitment from the addressee.

— I answer, that the word may be considered under a double notion, either as it is operative of faith, or as it is promissive of rest to believers: take it as operative of faith, and so it profits, not being mixed with faith, otherwise faith could not come by hearing, as the apostle asserts, (Rom. x. 17); but take it as promissive of rest to believers, and so it doth not profit, not being mixed with faith; that is, faith, which is the condition of the promise, not being performed, the eternal rest, which is the thing promised, cannot belong to them: and this is clearly the apostle's meaning;

— Changing the expression—shall is predictive, and will is promissive in the first person only; whereas, in the second and third, will is predictive, and shall promissive.