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 generally has a fragrant smell and so one would have thought that any fragrance would be acceptable. Therefore the Torah teaches that not every incense was fit for the Tabernacle This is just 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.