In this paper, the author focuses on the ethics of the (Polish) humanist. He tries to emphasize the proper domain of his moral reflection. This domain is not reducible to prescriptions of general ethics, not even so-called ethics of science. It is because of the fact that the work of the humanist is characterized by commitment to the special ideal of truth. It is not necessarily an universal truth. Its sources are so-called extra-scientific values - religion, national solidarity, the well-being of humanity defined in terms of some ideology. The moral aspect of the humanist work manifests in minimizing the damages caused by the presence of extra-scientific values and in executing the rules of the good work.