But if the injured party to a bilateral contract has not fully performed and there has been no actual violation of promise by the other party (unless words expressing the speaker's intention concerning what he will do in the future can be so considered) yet because of repudiation thus expressed there is reason to believe that the latter will not fulfil his contractual obligation, the situation presents greater difficulty. In Frost v. Knight,42 Cockburn, C. J., thus stated the law: "The promisee, if he pleases, may treat the notice of intention as inoperative, and await the time when the contract is to be executed, and then hold the other party responsible for all the consequences of non-performance; but in that case he keeps the contract alive for the benefit of the other party as well as his own; he remains subject to all his own obligations and liabilities under it, and enables the other party not only to complete the contract, if so advised, notwithstanding his previous repudiation of it, but also to take advantage of any supervening circumstance which would justify him in declining to complete it.

"On the other hand, the promisee may, if he thinks proper, treat the repudiation of the other party as a wrongful putting an end to the contract, and may at once bring his action as on a breach of it; and in such action he will be entitled to such damages as would have arisen from the non-performance of the contract at the appointed time, subject, however, to abatement in respect of any circumstances which may have afforded him the means of mitigating his loss."43