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And, if the promisee has a right to use force himself for such a purpose, he has a right to secure such co-operative force from others as they are willing to extend.

On the contrary, if the promise is part of an onerous contract, the promisor is bound in justice and the promisee obtains a strict right.

Hence in the great majority of cases the promisee cannot compel performance in specie.

This something given by the promisee and accepted by the promisor in return for his undertaking is what we now call the consideration for the promise.

If the act promised becomes unlawful between the making and the execution of the promise, the promise is made void, and the promisee has no ground of complaint against the promiser.