And you shall make an altar for burning incense…Aaron shall burn upon it the aromatic incense morning after morning…you shall not offer up on it unfit incense… Incense has a fragrant smell and so one would have thought that any fragrance is acceptable. And yet, the Torah provide a specific recipe – not every incense can be used. This is another example of the demand that we bend ourselves to the will of God and not fragrance His Torah with that which smells sweet to us.