[The difficult nursing's relationship with knowledge].

This article claim the existence and the necessity of nursing knowledge and support this claim with definitions and rules from other disciplines, it summarizes briefly the evolution of nursing knowledge, mostly from a North American perspective, it examine its degree of presence in nursing scholarly work, to highlight some conclusions and present briefly two explanations related to the use and development of nursing knowledge by the nursing community. In conclusion, the necessity of learning, analyzing, testing and using nursing knowledge is reiterated.