Motive of inquiry
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All men inquire into causes.
And first, it is peculiar to the nature of man to be inquisitive into the causes of the events they see, some more, some less, but all men so much as to be curious in the search of the causes of their own good and evil fortune.
Hobbes, Lev XII 2
Inquiry is caused by anxiety about the future.
Anxiety for the future time disposeth men to inquire into the causes of things: because the knowledge of them maketh men the better able to order the present to their best advantage.
Hobbes, Lev XI 24
Curiosity about causes comes ultimately from the same desire for happiness that we see in animals.
Thirdly, whereas there is no other felicity of beasts but the enjoying of their quotidian food, ease, and lusts; as having little or no foresight of the time to come for want of observation and memory of the order, consequence, and dependence of the things they see; man observeth how one event hath been produced by another, and remembereth in them antecedence and consequence; and when he cannot assure himself of the true causes of things (for the causes of good and evil fortune for the most part are invisible), he supposes causes of them, either such as his own fancy suggesteth, or trusteth to the authority of other men such as he thinks to be his friends and wiser than himself.
Hobbes, Lev XII 4