The Seven Precepts of the Children of Noah can therefore be viewed as the "starting point" of a Noahide's spiritual life. And a Noahide can continue to grow by studying and fulfilling all those mitzvos of the Torah that make one a more ethical and loving person. There is another halachic opinion which is related to our discussion. Rabbi Nissim Gaon, a renowned 11th century sage, writes in his famous introduction to the Talmud that human beings in every generation have an obligation to perform any precept which is suggested by "reason" and "the understanding of the heart." If the prohibition against "loshon hara" can be understood by reason and/or the understanding of the heart, then it may be that Gentiles are already obligated in these laws, according to Rabbi Nissim Gaon. This is a matter that needs to be decided by authorities on Torah law.
To summarize: According to the above sources, it may be that Noahides are obligated in part or all of the Torah's laws of ethical speech, and one should consult a rabbi who is familiar with these laws for a decision. And it is highly commendable for Noahides to voluntarily fulfill all the mitzvos of the Torah regarding ethical and loving behavior, including the mitzvos of ethical speech. As Rabbi Hirsch teaches, they will certainly fulfill these mitzvos in the messianic age. For the Torah contains teachings and precepts which enable all the Children of Noah to become ethical, caring, and loving people and thereby fulfill their potential as human beings created in the Divine image. May we therefore merit to experience the age when, "Torah will go forth from Zion and the word of Hashem from Jerusalem.<ref>[http://www.noahidenations.com/content/index.php?option=com_content&task=view&id=171&Itemid=38 Noahide Nations]</ref>
