Wasteful thoughts – anxiety, stress, blame, guilt, etc – form a large part of our thinking process. It can consume a significant portion of time and energy in a day. Mindfulness involves recognizing wasteful thoughts while thinking and seeing them drop off, at least sometimes. The character of Nobel Laureate John Nash Jr. as depicted in the movie “A beautiful mind” advocates an approach to wasteful thoughts called “diet of the mind”. Jalaluddin Rumi, a 13th-century Sufi poet, suggests welcoming every thought be it “a joy, a depression or a meanness” in his poem “The guest house”. Are these two seemingly different approaches to wasteful thoughts, Nash’s dieting, and Rumi’s welcoming, related? What’s common between them? Could they be complementary? I attempt to explore these questions in this article.