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Extrait de A TREATISE OF HUMAN NATURE:

This perhaps will be the fate of what I have here advanced concerning belief, and though the proofs I have produced appear to me perfectly conclusive, I expect not to make many proselytes to my opinion.
Men will scarce ever be persuaded, that effects of such consequence can flow from principles, which are seemingly so inconsiderable, and that the far greatest part of our reasonings with all our actions and passions, can be derived from nothing but custom and habit.
To obviate this objection, I shall here anticipate a little what would more properly fall under our consideration afterwards, when we come to treat of the passions and the sense of beauty.
There is implanted in the human mind a perception of pain and pleasure, as the chief spring and moving principle of all its actions.
But pain and pleasure have two ways of making their appearance in the mind; of which the one has effects very different from the other.
They may either appear in impression to the actual feeling, or only in idea, as at present when I mention them.
It is evident the influence of these upon our actions is far from being equal.
Impressions always actuate the soul, and that in the highest degree; but it is not every idea which has the same effect.
Nature has proceeded with caution in this came, and seems to have carefully avoided the inconveniences of two extremes.
Did impressions alone influence the will, we should every moment of our lives be subject to the greatest calamities; because, though we foresaw their approach, we should not be provided by nature with any principle of action, which might impel us to avoid them.
On the other hand, did every idea influence our actions, our condition would not be much mended.
For such is the unsteadiness and activity of thought, that the images of every thing, especially of goods and evils, are always wandering in the mind; and were it moved by every idle conception of this kind, it would never enjoy a moment's peace and tranquillity.
Nature has, therefore, chosen a medium, and has neither bestowed on every idea of good and evil the power of actuating the will, nor yet has entirely excluded them from this influence.
Though an idle fiction has no efficacy, yet we find by experience, that the ideas of those objects, which we believe either are or will be existent, produce in a lesser degree the same effect with those impressions, which are immediately present to the senses and perception.
The effect, then, of belief is to raise up a simple idea to an equality with our impressions, and bestow on it a like influence on the passions.
This effect it can only have by making an idea approach an impression in force and vivacity.
For as the different degrees of force make all the original difference betwixt an impression and an idea, they must of consequence be the source of all the differences in the effects of these perceptions, and their removal, in whole or in part, the cause of every new resemblance they acquire.
Wherever we can make an idea approach the impressions in force and vivacity, it will likewise imitate them in its influence on the mind; and vice versa, where it imitates them in that influence, as in the present case, this must proceed from its approaching them in force and vivacity.
Belief, therefore, since it causes an idea to imitate the effects of the impressions, must make it resemble them in these qualities, and is nothing but A MORE VIVID AND INTENSE CONCEPTION OF ANY IDEA.
This, then, may both serve as an additional argument for the present system, and may give us a notion after what manner our reasonings from causation are able to operate on the will and passions.
As belief is almost absolutely requisite to the exciting our passions, so the passions in their turn are very favourable to belief; and not only such facts as convey agreeable emotions, but very often such as give pain, do upon that account become more readily the objects of faith and opinion.