The law and morality the interrelation issue has been the subject for many discussions, recent works in the philosophy field and law ethics of renowned authors as H. Hart, L. Fuller and J. Finnis, who contributed significantly to the topic. The key question about the moral content of law is examined within the polemics between theorists of legal positivism and natural law legal theorists. This article touches upon this issue by the example of the concept of John Finnis, one of the most brilliant contemporary law philosophers, his neo-naturalistic concept of natural law includes some ideas of modern positivism. J. Finnis claims natural law appears as a set of principles of practical reasonableness for the ordering of human life and the human community. Law acts as a method to ensure “the common good” of the community and is based on seven self-evident, as he believes the basic human goods necessary for the human flourishing. The requirements of practical reasonableness compose the content of natural law, contain recommendations on how to carry out these self-evident goods. For Finnis, the aim of law is to provide conditions, according to the requirements of practical reasonableness, in which these seven goods can be realized. It is outlined that J. Finnis regards law as a social institute which purpose is to regulate human affairs, and thus to promote the creation of a community where everyone could realize the seven fundamental goods for humankind.