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阿豆
I can say that the so-called belief is a more vivid, active, strong, firm, and stable conception of objects than the conceptions constituted by imagination alone. Nature has established various connections between various particular ideas, and as soon as an idea appears in the mind, it immediately brings in its related ideas by a slow and imperceptible movement, and brings them to our attention. These principles of connection we have classified into three kinds, one is the relation of similarity, the other is the relation of proximity, and the third is the relation of cause and effect. Only these three ties can connect our various ideas and can give birth to a regular string of reflections or inferences that human beings more or less always have.