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Extrait de A TREATISE OF HUMAN NATURE:

SECT. III. OF THE ANTIENT PHILOSOPHY.
Several moralists have recommended it as an excellent method of becoming acquainted with our own hearts, and knowing our progress in virtue, to recollect our dreams in a morning, and examine them with the same rigour, that we would our most serious and most deliberate actions.
Our character is the same throughout, say they, and appears best where artifice, fear, and policy have no place, and men can neither be hypocrites with themselves nor others.
The generosity, or baseness of our temper, our meekness or cruelty, our courage or pusilanimity, influence the fictions of the imagination with the most unbounded liberty, and discover themselves in the most glaring colours.
In like manner, I am persuaded, there might be several useful discoveries made from a criticism of the fictions of the antient philosophy, concerning substances, and substantial form, and accidents, and occult qualities; which, however unreasonable and capricious, have a very intimate connexion with the principles of human nature.
It is confest by the most judicious philosophers, that our ideas of bodies are nothing but collections formed by the mind of the ideas of the several distinct sensible qualities, of which objects are composed, and which we find to have a constant union with each other.
But however these qualities may in themselves be entirely distinct, it is certain we commonly regard the compound, which they form, as ONE thing, and as continuing the SAME under very considerable alterations.
The acknowledged composition is evidently contrary to this supposed simplicity, and the variation to the identity.
It may, therefore, be worth while to consider the causes, which make us almost universally fall into such evident contradictions, as well as the means by which we endeavour to conceal them.
It is evident, that as the ideas of the several distinct, successive qualities of objects are united together by a very close relation, the mind, in looking along the succession, must be carryed from one part of it to another by an easy transition, and will no more perceive the change, than if it contemplated the same unchangeable object.
This easy transition is the effect, or rather essence of relation; I and as the imagination readily takes one idea for another, where their influence on the mind is similar; hence it proceeds, that any such succession of related qualities is readily considered as one continued object, existing without any variation.
The smooth and uninterrupted progress of the thought, being alike in both cases, readily deceives the mind, and makes us ascribe an identity to the changeable succession of connected qualities.
But when we alter our method of considering the succession, and instead of traceing it gradually through the successive points of time, survey at once Any two distinct periods of its duration, and compare the different conditions of the successive qualities; in that case the variations, which were insensible when they arose gradually, do now appear of consequence, and seem entirely to destroy the identity.
By this means there arises a kind of contrariety in our method of thinking, from the different points of view, in which we survey the object, and from the nearness or remoteness of those instants of time, which we compare together.
When we gradually follow an object in its successive changes, the smooth progress of the thought makes us ascribe an identity to the succession; because it is by a similar act of the mind we consider an unchangeable object.
When we compare its situation after a considerable change the progress of the thought is.
broke; and consequently we are presented with the idea of diversity: In order to reconcile which contradictions the imagination is apt to feign something unknown and invisible, which it supposes to continue the same under all these variations; and this unintelligible something it calls a substance, or original and first matter.
We entertain a like notion with regard to the simplicity of substances, and from like causes.
Suppose an object perfectly simple and indivisible to be presented, along with another object, whose co-existent parts are connected together by a strong relation, it is evident the actions of the mind, in considering these two objects, are not very different.
The imagination conceives the simple object at once, with facility, by a single effort of thought, without change or variation.
The connexion of parts in the compound object has almost the same effect, and so unites the object within itself, that the fancy feels not the transition in passing from one part to another.