In many verses we read that everything and every affair has a measure. Anything, be it physical or spiritual has certain extremes, or utmost points or borders, which is dangerous to exceed or transgress. In other word, nothing in this world exists without a measure or without an account. As an example we may mention the blood which circulates in our veins. It consists of some twenty or more elements, all of which must have a certain amount or number! An increase or decrease of that amount or number will result in a dangerous fault and failure, which manifests itself in some sort of a disease! Such an account is not only in man's blood, but in everything that can exist! Therefore, if man wants to live free of defects and faults he must observe the medium in between the two settled extremes of all things and all affairs.