His pupil was Chrysippus who became one of the most important Stoic thinkers .
Among the fragments of Cleanthes ' writings which have come down to us , the largest is a Hymn to Zeus .
Zeus ' pupil was Chrysippus who became one of the most important Stoic thinkers .
Among the fragments of Cleanthes ' writings which have come down to us , the largest is a Hymn to Zeus .