Likutei Moharan, Part II 39:2/ליקוטי מוהר"ן·תנינא ל״ט:ב׳

12. The Six Days are the beginning, in which everything was created. Shabbat is the end and ultimate purpose…. And there certainly are distinctions between the creations, because there certainly are differences between that which was created before and that which was created on Day Six, which is closer to Shabbat. Thus it is brought in the holy books: “six days God made heaven and earth” (Exodus 31:17)—that also the Six Days themselves were created. Kabbalistically, they are [points that form] a circle around an inner point, which is Shabbat (Zohar II, 204a). Even so, there are distinctions.