T.Z. Lavine Quote

These three laws, by which our thinking is naturally impelled from one idea to another which resembles it, or which is next to it, or is its effect—these three laws characterize all our mental operations, including all our reasoning, and specifically they characterize our scientific ideas. Of the three laws of association of ideas, the association or connection of ideas by cause and effect, says Hume, is the most powerful connection between our ideas.