चपलता नाम रागद्वेषमात्सर्यामर्षाप्रतिकूल्यादिभिर्विभावैः समुत्पद्यते । तस्याश्च वाक्पारुष्यनिर्भर्त्सनवधबन्धसम्प्रहार- ताडनादिभिरनुभावैरभिनयः प्रयोक्तव्यः । अत्रार्या भवति - अविमृश्य तु यः कार्यं पुरुषो वधताडनं समारभते । अविनिश्चितकारित्वात्स तु खलु चपलो बुधैर्ज्ञेयः ॥ ६०॥
Inconstancy (capalatā) is caused by Determinants such as love, hatred, malice, impatience, jealousy, opposition and the like. It is to be represented on the stage by Consequents such as harsh words, rebuke, beating, killing, taking prisoner, goading and the like. There are two Āryās on this point: 60. When a man does anything like killing or beating any one without any forethought, he is said to be inconstant because of his not being definite in his action.
english translation