b. Manifestation of
intention.... The phrase "manifestation of intention" adopts an external or objective standard for interpreting conduct; it means the
external expression of intention as distinguished from undisclosed intention. A promisor manifests
an intention if he believes or has reason to believe that the promisee will infer that intention
from his words or conduct.
e. Illusory promises;
mere statements of intention. Words of promise which by their terms make performance entirely optional with the "promisor" whatever
may happen, or whatever course of conduct in other respects he may pursue, do not constitute a
promise....On the other hand, a promise may be made even though no duty of performance can arise
unless some event occurs (see §§224, 225(1)). Such a conditional promise is no less a promise
because there is small likelihood that any duty of performance will arise, as in the case of a
promise to insure against fire a thoroughly fireproof building. There may be a promise in such a case even
though the duty to perform depends on a state of mind of the promisor other than his own unfettered
wish (see §228), or on an event within the promisor's control.