1 Abstract This thesis deals with the principles of good morals and public order focusing on their role function as limits restricting the autonomy of the will. Although both principles are vague legal concepts, this thesis doesn't seek to define exactly not even cover all the practical possibilities of their application. The aim of the thesis was to bring the possible content of these principles and to highlight their importance in assessing the validity of legal actions or to specify further consequences of legal conduct, which would be contrary to these principles. The view on this topic is primarily from the Czech law perspective. On exemplary and a limited number of legal institutes, this thesis tries to capture the possibilities of us...