Seneca walks the walk

Seneca emphasises that philosophy is to be livedZenonem Cleanthes non expressisset, si tantummodo audisset.Cleanthes would not have imitated Zeno if he had merely heard himZenonem: Zeno (accusative singular)Cleanthes: proper noun (nominative singular)Non: notExpressisset: would have imitatedSi: ifTantummodo: only, merelyAudisset: had heard