Our assent to the hypothesis implies that it is held to be true of all particular instances. That these cases belong to past or to future times, that they have or have not already occurred, makes no difference in the applicability of the rule to them. Because the rule prevails, it includes all cases.
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Part 2, Book 11, ch. 5, sect. 3, art. 10William Whewell
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Pedantry and mastery are opposite attitudes toward rules. To apply a rule to the letter, rigidly, unquestioningly, in cases where it fits and in cases where it does not fit, is pedantry. ... To apply a rule with natural ease, with judgment, noticing the cases where it fits, and without ever letting the words of the rule obscure the purpose of the action or the opportunities of the situation, is mastery.
George Polya
No hard and fast rule can be laid down as to where our legislation shall stop in interfering between man and man, between interest and interest. All that can be said is that it is highly undesirable on the one hand, to weaken individual initiative, and on the other hand, that in a constantly increasing number of cases we shall find it necessary in the future to shackle cunning as in the past we have shackled force.
Theodore Roosevelt
Don't just read it; fight it! Ask your own question, look for your own examples, dicover your own proofs. Is the hypothesis necessary? Is the converse true? What happens in the classical special case? What about the degenerate cases? Where does the proof use the hypothesis?
Paul Halmos
In the first place, it is not improper to observe, that the law of cases of necessity is not likely to be well furnished with precise rules; necessity creates the law, it supersedes rules; and whatever is reasonable and just in such cases, is likewise legal; it is not to be considered as matter of surprise, therefore, if much instituted rule is not to be found on such subjects.
William Scott Stowell
No man can certainly know, or ought to conclude, concerning himself or others, as long as they live, that the season of grace is quite over with them. As we can conceive no rule God hath set to Himself to proceed by, in ordinary cases of this nature; so nor is there any He hath set unto us to judge by, in this case. It were to no purpose, and could be of no use to men to know so much; therefore it were unreasonable to expect God should have settled and declared any rule, by which they might come to the knowledge of it.
John Howe
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