Quintilian was a Greek orator that was notable for his several philosophies on speaking. He believed that eloquence is derived from the force of imagination and memory.
Quintilian mentioned a host of factors that he believed were necessary for forming a good orator. Education was a vital factor.
He believed that children should be taught at an early age the language that will prove vital to their becoming excellent orators.
The power of imagination and the strength of memory are other factors that he believed were necessary. An eloquent speaker should also have a good store of words.