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The degree and direction of each motion is recommended with such precision that a living animal may as soon emerge from the stun of two bodies in motion in some other degree or direction than what is really delivered by it. Would we shape a fair and exact thought of necessity, we should consider whence that thought emerges when we apply it to the operation of bodies.

It appears to be clear that, if every one of the scenes of nature were consistently moved in such a way, to the point that no two occasions looked to some extent like each other, yet every object was completely new, with no likeness to whatever had been seen some time recently, we ought to never have achieved minimal thought of necessity, or of an association among these objects.

We may state that one object or occasion has taken after another, not that one was delivered by the other. The connection of cause and effect must be absolutely obscure to humanity. Induction and thinking concerning the operations of nature would be at an end, and the memory and faculties remain the main channels, by which the information of any genuine existence could approach the brain.

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The possibility of necessity and causation emerges altogether from the consistency detectable in the operations of nature, where comparable objects are continually conjoined together, and the brain is controlled by custom to construe the one from the presence of the other.

These two conditions frame the entire of that necessity, which we attribute to matter. Past the consistent conjunction of comparable objects, and the resulting deduction from one to the next, we have no idea of any necessity or association.

On the off chance that it create the impression that all humanity have ever permitted that these two conditions happen in the intentional actions of men, and in the operations of psyche, it must take after, that all humankind have ever concurred in the precept of necessity, and that they have heretofore questioned, only for not seeing each other.

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With regards to the first situation, the steady and normal conjunction of comparative occasions, we may potentially fulfill ourselves by the accompanying contemplations. It is generally recognized that there is a great consistency among the actions of men, in all countries and ages, and that human nature stays still the same, in its standards and operations.

Similar intentions dependably deliver similar actions. Similar occasions take after from similar causes. Humankind are so much the same, in all times and places, that history illuminates us of just the same old thing new or interesting in this specific.

Its main purpose is just to find the steady and widespread standards of human nature, by demonstrating men in all assortments of conditions and circumstances, and outfitting us with materials from which we may frame our perceptions and end up noticeably familiar with the customary springs of human activity and conduct.

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References:
https://study.com/academy/lesson/cause-and-effect-relationship-definition-examples-quiz.html
https://manoa.hawaii.edu/exploringourfluidearth/standards-alignment/next-generation-science-standards-ngss/crosscutting-concepts/cause-and-effect
https://en.wikipedia.org/wiki/Causality