The Will to Believe, and Other Essays in Popular Philosophy · William James
I.
Let us give the name of _hypothesis_ to anything that may be proposed to our belief; and just as the electricians speak of live and dead wires, let us speak of any hypothesis as either _live_ or _dead_. A live hypothesis is one which appeals as a real possibility to him to whom it is proposed. If I ask you to believe in the Mahdi, the notion makes no electric connection with your nature,--it refuses to scintillate with any credibility at all. As an hypothesis it is completely dead. To an Arab, however (even if he be not one of the Mahdi's followers), the hypothesis is among the mind's possibilities: it is alive. This shows that deadness and liveness in an hypothesis are not intrinsic properties, but relations to the {3} individual thinker. They are measured by his willingness to act. The maximum of liveness in an hypothesis means willingness to act irrevocably. Practically, that means belief; but there is some believing tendency wherever there is willingness to act at all. Next, let us call the decision between two hypotheses an _option_. Options may be of several kinds. They may be--1, _living_ or _dead_; 2, _forced_ or _avoidable_; 3, _momentous_ or _trivial_; and for our purposes we may call an option a _genuine_ option when it is of the forced, living, and momentous kind.
3. Finally, if I were Dr. Nansen and proposed to you to join my North Pole expedition, your option would be momentous; for this would probably be your only similar opportunity, and your choice now would either exclude you from the North Pole sort of immortality altogether or put at least the chance of it into your hands. He who refuses to embrace a unique opportunity loses the prize as surely as if he tried and failed. _Per contra_, the option is trivial when the opportunity is not unique, when the stake is insignificant, or when the decision is reversible if it later prove unwise. Such trivial options abound in the scientific life. A chemist finds an hypothesis live enough to spend a year in its verification: he believes in it to that extent. But if his experiments prove inconclusive either way, he is quit for his loss of time, no vital harm being done. It will facilitate our discussion if we keep all these distinctions well in mind.
Ideas discussed in this chapter
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