Parsha Tzav

Perpetual Fire
The verse reads: "A perpetual fire shall burn on the
altar--it shall not go out." 
On this verse the Jerusalem Talmud comments, "continually - even on Shabbat; continually - even in a state of impurity."`
As has been mentioned before, every aspect of the physical Sanctuary has its counterpart in the inward Sanctuary within the soul of the Jew.
In his Likkutei Torah, Rabbi Schneur Zalman of Liadi explains that the altar is the heart of the Jew.  Corresponding to the two altars of the Sanctuary, the outer and the inner, are the outer and inner levels of the heart, its surface personality and its essential core.
The altar on which the continual fire was to be set was the outer one.  For the Jew this means that the fire of his love for G-d must be outward, open and revealed.  It is not a private possession, to be cherished subconsciously.  It must show in the face he sets towards the world.