Referring to the encyclical of John Paul II Fides et ratio, the article addresses the problem of truth in its legal dimension. That is, what is truth for law? What truth does law serve? In other words, does truth that law aims at correspond to the real and natural order of things, i.e. is it possible to reach the absolute truth by means of speculations and legal constructs? On the contrary, even the most existential experiences, such as ‘life’ and ‘death’, will not agree with the truth as a result of certain legal actions, creating a different nature and reality. The analysis carried out showed that law uses a specific category of truth, i.e. a formal and procedural truth which does not necessarily correspond to the absolute truth about which Pope John Paul II writes in his encyclical. If this specific, formal and procedural legal truth is subordinated to the implementation of the guiding principle of achieving the absolute truth, then such a situation should not raise concern. It will be worse if law starts to deviate from the pursuit of absolute truth, succumbing only to some ad hoc, pragmatic criteria based on erroneous beliefs that everything should be subordinated to technology and the will of the majority because fundamental standards common to all people do not exist or cannot be indicated.