According to Eckhart,

I have read many writings both of heathen philosophers and sages, of the Old and the New Testaments, and I have earnestly and with all diligence sought the best and the highest virtue

whereby man may come most closely to God and wherein he may once more become like the original image as he was in God when there was yet no distinction between God and himself before God produced creatures. And having dived into the basis of things to the best of my ability I find that it is no other than absolute detachment (abegescheidenheit) from everything that is created. It was in this sense when our Lord said to Martha: "One thing is needed," which is to say: He who would be untouched and pure needs just one thing, detachment