“all progress of mind consists for the most part in differentiation, in the resolution of an obscure and complex object into its component aspects”
Pater describes intellectual progress as learning to distinguish parts within what initially seems confused, a method that makes clearer categories and more exact judgment possible.
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Appreciations, with an Essay on Style, essay “Style,” printed page 5 in the standard Macmillan 1910 Library Edition pagination reproduced by Project Gutenberg #4037. “all progress of mind consists for the most part in differentiation...” opens Pater’s argument by distinguishing prose, verse and poetry. This is literary-aesthetic criticism, not a modern experimental claim about cognition or learning.