This paper sets out to conceptualize what goes on in the analyst's mind as he listens – and expresses something to the patient. Bion's ideas of approaching the patient's O, without memory and desire, are discussed. An alternate, more permissive, attitude to desire is suggested. This is based on the idea that containment, instead of denoting a dyadic interaction between mother and child, is a process which links the child to a begetting couple, thus a triad. Containing the patient corresponds, in the unconscious, to thinking about a sexual couple in a mutually beneficent interaction. Since the patient's anxiety, in his unconscious, parallels a frightening primal scene, containment is viewed as a continuous translation of a primitive primal scene into a mature act of love. A specific kind of genital desire is thus necessary for containment. This finds expression in the analyst's resonance with the patient. Clinical material from an analysis with a 7-year old boy is provided.