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This article proposes to explore the idea of witness in Marius Victorinus in distinguishing three of its modalities. The first is the witness of John the Baptist. John is the “echo of the voice,” that is to say, he is the image of the first expression of God, who is the Christ. At stake in this first bearing of witness is the recognition of Christ’s identity and the profession of his status as the Son of God. This first modality of witness is, however, possible only on the condition of the witness of the Holy Spirit. This latter is the “voice of the voice,” that is to say, it is the interior, spiritual, repossession of what is found deployed in the exteriority of the world by Christ. Finally, the third dimension of witness calls upon the Trinitarian theology of Marius Victorinus: the witness with respect to Christ in the economy of salvation is possible only on the basis of the initial understanding of the life of the Son in the immanent being of God. The Victorinian mediation of witness thus allows for the articulation of the plan of Trinitarian doctrine and the plan of the coming of salvation.