“ A dangerous ulcer had compelled him to fast for a time. Subsequently he continued his abstinence, saying that, as he was already half-way on the road to death, he would not trouble to retrace his steps. ”

“ The principal is the large portion of the Hymn to Zeus which has been preserved in Stobaeus. He regarded the sun as the abode of God, the intelligent providence, or (in accordance with Stoical materialism) the vivifying fire or aether of the universe. Virtue, he taught, is life according to nature; but pleasure is not according to nature. ”

“ He originated a new theory as to the individual existence of the human soul; he held that the degree of its vitality after death depends upon the degree of its vitality in this life. The principal fragments of Cleanthes’s works are contained in Diogenes Laertius and Stobaeus; some may be found in Cicero and Seneca.
See G. C. Mohinke, Kleanthes der Stoiker (Greifswald, 1814) ; C. Wachsmuth, Commentationes de Zenone Citiensi et Cleanthe Assio (Göttingen, 1874–1875) ; A. C. Pearson, Fragments of Zeno and Cleanthes (Camb., 1891) ”