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The phrases in their context!

Extract from A TREATISE OF HUMAN NATURE:

As to the influence of contiguity and resemblance, we may observe, that if the contiguous and resembling object be comprehended in this system of realities, there is no doubt but these two relations will assist that of cause and effect, and infix the related idea with more force in the imagination.
This I shall enlarge upon presently.
Mean while I shall carry my observation a step farther, and assert, that even where the related object is but feigned, the relation will serve to enliven the idea, and encrease its influence.
A poet, no doubt, will be the better able to form a strong description of the Elysian fields, that he prompts his imagination by the view of a beautiful meadow or garden; as at another time he may by his fancy place himself in the midst of these fabulous regions, that by the feigned contiguity he may enliven his imagination.
But though I cannot altogether exclude the relations of resemblance and contiguity from operating on the fancy in this manner, it is observable that, when single, their influence is very feeble and uncertain.
As the relation of cause and effect is requisite to persuade us of any real existence, so is this persuasion requisite to give force to these other relations.
For where upon the appearance of an impression we not only feign another object, but likewise arbitrarily, and of our mere good-will and pleasure give it a particular relation to the impression, this can have but a small effect upon the mind; nor is there any reason, why, upon the return of the same impression, we should be determined to place the same object in the same relation to it.
There is no manner of necessity for the mind to feign any resembling and contiguous objects; and if it feigns such, there is as little necessity for it always to confine itself to the same, without any difference or variation.
And indeed such a fiction is founded on so little reason, that nothing but pure caprice can determine the mind to form it; and that principle being fluctuating and uncertain, it is impossible it can ever operate with any considerable degree of force and constancy.
The mind forsees and anticipates the change; and even from the very first instant feels the looseness of its actions, and the weak hold it has of its objects.
And as this imperfection is very sensible in every single instance, it still encreases by experience and observation, when we compare the several instances we may remember, and form a general rule against the reposing any assurance in those momentary glimpses of light, which arise in the imagination from a feigned resemblance and contiguity.
The relation of cause and effect has all the opposite advantages.
The objects it presents are fixt and unalterable.
The impressions of the memory never change in any considerable degree; and each impression draws along with it a precise idea, which takes its place in the imagination as something solid and real, certain and invariable.
The thought is always determined to pass from the impression to the idea, and from that particular impression to that particular idea, without any choice or hesitation.
But not content with removing this objection, I shall endeavour to extract from it a proof of the present doctrine.
Contiguity and resemblance have an effect much inferior to causation; but still have some effect, and augment the conviction of any opinion, and the vivacity of any conception.
If this can be proved in several new instances, beside what we have already observed, it will be allowed no inconsiderable argument, that belief is nothing but a lively idea related to a present impression.
To begin with contiguity; it has been remarked among the Mahometans as well as Christians, that those pilgrims, who have seen MECCA or the HOLY LAND, are ever after more faithful and zealous believers, than those who have not had that advantage.
A man, whose memory presents him with a lively image of the Red-Sea, and the Desert, and Jerusalem, and Galilee, can never doubt of any miraculous events, which are related either by Moses or the Evangelists.
The lively idea of the places passes by an easy transition to the facts, which are supposed to have been related to them by contiguity, and encreases the belief by encreasing the vivacity of the conception.