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Michel de Certeau wrote to Henri de Lubac that he owed him his calling as a Jesuit and, in 1983, “what is the most essential”. Their correspondence (only known to us from his letters) reveals a relationship that Certeau qualifies as “filial and fraternal”. This was the case above all in the 1960s – when he was working for Christus and becoming the historian of the Company’s spirituality in the modern period – but this relationship was almost entirely interrupted. Hence, we call upon another source, in the last part of this study, in order to attempt to elucidate this near-rupture: the letters between Lubac and Henri Bouillard.