In the opening verse of this week’s Parsha, Kedoshim, Hashem commands Moshe “Daber El Kol Edas Binei Yisrael Veamarta Alayhem Kedoshim Tihiyu… “Speak to the Children of Israel and say to them ‘You shall be holy…’”
This commandment appears to be very vague One can easily obey a commandment to do something such as keeping the Sabbath, fast on Yom Kippur.  How does one fulfill a commandment to be holy?

The Ramban offers an explanation as to what it means to be holy and the basis of his explanation is that one can easily become a Naval Birshut Hatorah (“scoundrel within the domain of that which is permitted by the Torah.”) unless one makes the effort to be “holy” in all your ways The Torah permits one to drink wine and eat meat, but with these rights the Torah does not mention any restrictions. Accordingly, without the commandment to be holy, one would be permitted to involve oneself in voracious, gluttonous, rapacious, and ravenous behavior. However, we are commanded to be holy, which prohibits such behavior.  For being Holy requires us to live a life of moderation and control.  One must always obey Hashem’s commandments. Additionally, we must do so in a way that we be holy.  It is not sufficient to observes only the letter of the law and thus be a Naval Birshut Hatorah, – an unrestrained person with the permission of the Torah.  Without the “be holy” commandment, one can easily become a Naval Birshut Hatorah.  A person can keep to the letter of the law, enjoy self-indulgence and gluttony and avoid responsibility, because it is not wrong technically. Yet the person is violating the commandment to be holy.

We can explain the idea of the Ramban with the famous saying of Voltaire, the 18th century philosopher who often attacked injustice and intolerance, and said: “Use, do not abuse; neither abstinence nor excess ever renders a man happy.”