Actions may be laudable or blameable; but they cannot be reasonable: Laudable or blameable, therefore, are not the same with reasonable or unreasonable. The merit and demerit of actions frequently contradict, and sometimes controul our natural propensities. But reason has no such influence. Moral distinctions, therefore, are not the offspring of reason. Reason is wholly inactive, and can never be the source of so active a principle as conscience, or a sense of morals.
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Part 1 Of virtue and vice in general, Sect. 1 Moral distinctions not deriv'd from reasonDavid Hume
To me the entire uselessness of such rules^as practical guides lies in the inherent vagueness of the word "reasonable," the absolute impossibility of finding a definite standard, to be expressed in language, for the fairness and the reason of mankind, even of Judges. The reason and fairness of one man is manifestly no rule for the reason and fairness of another, and it is an awkward, but as far as I see, an inevitable consequence of the rule, that in every case where the decision of a Judge is overruled, who does or does not stop a case on the ground that there is, or is not, reasonable evidence for reasonable |men, those who overrule him say, by implication, that in the case before them, the Judge who is overruled is out of the pale of reasonable men.
John Coleridge
I applied my reason at every moment. Reason is excellent for getting food, clothing and shelter. Reason is the very best tool kit. Nothing beats reason for keeping tigers away. But be excessively reasonable and you risk throwing out the universe with the bathwater.
Yann Martel
Morals excite passions, and produce or prevent actions. Reason of itself is utterly impotent in this particular. The rules of morality, therefore, are not conclusions of our reason.
David Hume
...it is not to be doubted that the duration of this life is but a moment; that the state of death is eternal, whatever may be its nature; and that thus all our actions and thoughts must take such different directions according to the state of that eternity, that it is impossible to take one step with sense and judgment, unless we regulate our course by the truth of that point which ought to be our ultimate end. ...thus, according to the principles of reason, the conduct of men is wholly unreasonable, if they do not take another course. 195
Blaise Pascal
Even if there never have been actions arising from such pure sources, what is at issue here is not whether this or that happened; that, instead, reason by itself and independently of all appearances commands what ought to happen; that, accordingly, actions of which the world has perhaps so far given no example, and whose very practicability might be very much doubted by one who bases everything on experience, are still inflexibly commanded by reason ... because ... duty ... lies, prior to all experience, in the idea of a reason determing the will by means of apriori grounds.
Immanuel Kant
Hume, David
Humphrey, Hubert
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