evangelist John exposes the issue of faith (object) throughout his book. It has a purpose: if Peter is the reference in the Synoptics, the IV Gospel reports the faith of several characters: Nathanael (1.49), the Samaritan woman (4.19), the disciples represented by Peter (6.68-69) , the man born blind (9.38), the evangelist himself (19.35), Magdalene (20.18) and Thomas (20.28). However, it is in the sign about Lazarus that the profession of faith of a woman from the periphery describes a complete theology. Martha understands Jesus in three Christological dimensions: messianic (Christ), divine (Son of God) and incarnation (he was to come into the world). Whoever believes has eternal life because he has passed from death to life (Jn 5:24). Through historical-critical and sociological/conflictual methods, based on specialists in the Fourth Gospel, it is possible to see that Martha makes the encounter (apánthesis) with Jesus who reveals himself: I am the resurrection and the life... lives and believes in me, will by no means die forever (11:25-26). The article seeks to show the result of her act of faith: Martha believes (11, 27) and goes to announce to her sister that she has found Jesus.