 From the primitive artificial language of action a language of articulated sounds emerged, as Condillac had already explained in detail in the Essay: cries of different tonality were deemed suitable to express different emotions. This phenomenon is at the origin of the tonal accent of Greek and Latin, which Condillac took to be closer to the first spoken languages of humanity. Onomatopeia, he speculated, may have been at the origin of certain words used to designate certain things, while other words were chosen by way of analogy: for example, words for mental operations originally indicated words for the operations of the sense-organs (Essay II.i.2-3, Grammar I.7). Grammar gradually emerged, first reflecting the most basic needs of humanity and then gaining in complexity as needs multiplied. (Condillac makes the conjecture that in the syntax of these first languages the object of the action came first and preceded the verb, since the object was the most vital point of interest for primitive people: Essay II.i.9, Grammar II.8)