"As in the Phenomenology and elsewhere in his system, therefore, Hegel is concerned above all in the philosophy of nature not to reduce phenomena to mere expressions of a single, universal principle, but to understand the unique specificity of each phenomenon in turn, as well as the distinctive logic immanent in that specificity that makes further specificities necessary. In other words (and pace critics, such as Deleuze), Hegel endeavours throughout his mature work on nature and on the human spirit to develop a fully articulated philosophy of difference."