In this world of duality, this is good and this is bad has no meaning, it is called manodharma, mental concoction. However, the real truth is that Krsna says that: duhkhalayam asasvatam [Bg. 8.15], the world is a place of misery wherein repeated birth and death take place. Now this is good misery or bad misery? Misery is misery; and you have to die, good die or bad die? So to us everything material, without connection to Krsna, is to be rejected as stool, otherwise we will waste valuable time needed to solve the real problems of life, namely, birth, death, disease, and old-age.
Letter to Dr. Wolf, 20 May, 1976