It is from “The Talks of Instruction,” no. 4, “Of the Value of Resignation.” It is translated on p. 489 of the document linked below like this: “Do not think to place holiness in doing; we should place holiness in being, for it is not the works that sanctify us, but we who should sanctify the works.” https://german.yale.edu/sites/default/files/meister-eckhart-maurice-o-c-walshe-bernard-mcginn-the-complete-mystical-works-of-meister-eckhart-the-crossroad-publishing-company-2009.pdf