Wisdom from the Early Stoics, Zeno of Citium 47

And there are other shades of difference in propositions and grades of transition from true to false—and conversions of their terms—which we now go on to describe broadly. 

An argument, according to the followers of Crinis, consists of a major premise, a minor premise, and a conclusion, such as for example this: 

"If it is day, it is light; but it is day, therefore it is light." 

Here the sentence "If it is day, it is light" is the major premise, the clause "it is day" is the minor premise, and "therefore it is light" is the conclusion. 

A mood is a sort of outline of an argument, like the following: 

"If the first, then the second; but the first is, therefore the second is." 

—Diogenes Laërtius, 7.76