On Passions
On Passions (Greek: Περὶ παθῶν; Peri pathōn), also translated as On Emotions or On Affections, is a work by the Greek Stoic philosopher Chrysippus dating from the 3rd-century BCE. The book has not survived intact, but around seventy fragments from the work survive in a polemic written against it in the 2nd-century CE by the philosopher-physician Galen. In addition Cicero summarises substantial portions of the work in his 1st-century BCE work Tusculan Disputations.