In contrast to relying on something (on natural or social processes and on what others are expected to do), trust implies to believe more or less deeply in the other himself – in view of his genuine otherness which escapes our knowledge and calculation of risks. Having faith in others exposes us to severe disappointment in the case that they do not justify our belief, that is, our deep trust (which is faith). This essay examines trust in an historical perspective as a specific dimension of human vulnerability – in contrast to "systemic" trust.