At the time of Freud, Ferenczi was among the first to consider the consequences of interpersonal trauma and therefore to give full value to human connectedness (Mucci, 2014, 2020). With the concept of “fragmentation” he also described, ahead of his time, some of the most destructive consequences of trauma of human origin, leading also to a split of personality, which we today understand as the basis of severe psychopathology. On the contrary, Freud viewed repression as the basis of neuropathology (Mucci, 2021). We also owe to Ferenczi his revision of the concept of “identification with the aggressor,” with the internalization of the guilt and the aggressiveness of the persecutor, which also explains some of the destructive dynamics of severe psychopathology. Even the Oedipus complex and the theory of the death drive can be revised in light of Ferenczi’s views. In therapy with the traumatized, “embodied witnessing” (Mucci, 2018, 2022) is recommended.