Bion took for granted that the infant requires a mind to help it tolerate and organize experience. For Bion, thoughts exist prior to the development of an apparatus for thinking. The apparatus for thinking, the capacity to have thoughts "has to be called into existence to cope with thoughts" (1967, p. 111). Thoughts exist prior to their realization. Thinking, the capacity to think the thoughts which already exist, develops through another mind providing α-function (1962, p. 83)—through the "container" role of maternal reverie.