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The phrases in their context!

Extract from A TREATISE OF HUMAN NATURE:

that derived from the variations of those impressions, even while the external object, to all appearance, continues the same.
These variations depend upon several circumstances.
Upon the different situations of our health: A man in a malady feels a disagreeable taste in meats, which before pleased him the most.
Upon the different complexions and constitutions of men That seems bitter to one, which is sweet to another.
Upon the difference of their external situation and position: Colours reflected from the clouds change according to the distance of the clouds, and according to the angle they make with the eye and luminous body.
Fire. also communicates the sensation of pleasure at one distance, and that of pain at another.
Instances of this kind are very numerous and frequent.
The conclusion drawn from them, is likewise as satisfactory as can possibly be imagined.
It is certain, that when different impressions of the same sense arise from any object, every one of these impressions has not a resembling quality existent in the object.
For as the same object cannot, at the same time, be endowed with different qualities of the same sense, and as the same quality cannot resemble impressions entirely different; it evidently follows, that many of our impressions have no external model or archetype.
Now from like effects we presume like causes.
Many of the impressions of colour, sound, &c.
are confest to be nothing but internal existences, and to arise from causes, which no ways resemble them.
These impressions are in appearance nothing different from the other impressions of colour, sound, &c.
We conclude, therefore, that they are, all of them, derived from a like origin.
This principle being once admitted, all the other doctrines of that philosophy seem to follow by an easy consequence.
For upon the removal of sounds, colours, beat, cold, and other sensible qualities, from the rank of continued independent existences, we are reduced merely to what are called primary qualities, as the only real ones, of which we have any adequate notion.
These primary qualities are extension and solidity, with their different mixtures and modifications; figure, motion, gravity, and cohesion.
The generation, encrease, decay, and corruption of animals and vegetables, are nothing but changes of figure and motion; as also the operations of all bodies on each other; of fire, of light, water, air, earth, and of all the elements and powers of nature.
One figure and motion produces another figure and motion; nor does there remain in.
the material universe any other principle, either active or passive, of which we can form the most distant idea.