It should now be clear that "wonder" and philosophizing are connected with each other in a more essential sense than may at first appear in the statement, "Philosophy begins in wonder." For wonder is not merely the beginning, in the sense of initium, the first stage or phase of philosophy. Rather, wonder is the beginning in the sense of the "principle" (principium), the abiding, ever-intrinsic origin of philosophizing. It is not true to say that the philosopher, insofar as he philosophizes, ever "emerges from his wonder" — if he does depart from his state of wonder, he has ceased to philosophize.

pp. 105–106 - Leisure, the Basis of Culture (1948) - The Philosophical Act