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The phrases in their context!

Extract from A TREATISE OF HUMAN NATURE:

Terror, consternation, astonishment, anxiety, and other passions of that kind, are nothing but different species and degrees of fear.
It is easy to imagine how a different situation of the object, or a different turn of thought, may change even the sensation of a passion; and this may in general account for all the particular sub-divisions of the other affections, as well as of fear.
Love may shew itself in the shape of tenderness, friendship, intimacy, esteem, good-will, and in many other appearances; which at the bottom are the same affections; and arise from the same causes, though with a small variation, which it is not necessary to give any particular account of.
It is for this reason I have all along confined myself to the principal passion.
The same care of avoiding prolixity is the reason why I wave the examination of the will and direct passions, as they appear in animals; since nothing is more evident, than that they are of the same nature, and excited by the same causes as in human creatures.
I leave this to the reader's own observation; desiring him at the same time to consider the additional force this bestows on the present system.
SECT. X OF CURIOSITY, OR THE LOVE OF TRUTH
But methinks we have been not a little inattentive to run over so many different parts of the human mind, and examine so many passions, without taking once into the consideration that love of truth, which was the first source of all our enquiries.
Twill therefore be proper, before we leave this subject, to bestow a few reflections on that passion, and shew its origin in human nature.
It is an affection of so peculiar a kind, that it would have been impossible to have treated of it under any of those heads, which we have examined, without danger of obscurity and confusion.
Truth is of two kinds, consisting either in the discovery of the proportions of ideas, considered as such, or in the conformity of our ideas of objects to their real existence.
It is certain, that the former species of truth, is not desired merely as truth, and that it is not the justness of our conclusions, which alone gives the pleasure.
For these conclusions are equally just, when we discover the equality of two bodies by a pair of compasses, as when we learn it by a mathematical demonstration; and though in the one case the proofs be demonstrative, and in the other only sensible, yet generally speaking, the mind acquiesces with equal assurance in the one as in the other.
And in an arithmetical operation, where both the truth and the assurance are of the same nature, as in the most profound algebraical problem, the pleasure is very inconsiderable, if rather it does not degenerate into pain: Which is an evident proof, that the satisfaction, which we sometimes receive from the discovery of truth, proceeds not from it, merely as such, but only as endowed with certain qualities.
The first and most considerable circumstance requisite to render truth agreeable, is the genius and capacity, which is employed in its invention and discovery.
What is easy and obvious is never valued; and even what is in itself difficult, if we come to the knowledge of it without difficulty, and without any stretch of thought or judgment, is but little regarded.
We love to trace the demonstrations of mathematicians; but should receive small entertainment from a person, who should barely inform us of the proportions of lines and angles, though we reposed the utmost confidence both in his judgment and veracity.
In this case it is sufficient to have ears to learn the truth.
We never are obliged to fix our attention or exert our genius; which of all other exercises of the mind is the most pleasant and agreeable.
But though the exercise of genius be the principal source of that satisfaction we receive from the sciences, yet I doubt, if it be alone sufficient to give us any considerable enjoyment.
The truth we discover must also be of some importance.