Ramayana
सर्वथा तु महत्कर्म करिष्यति बलोत्कटः । राक्षसः पुत्रसहितो दृष्टमेतन्निसर्गतः ॥ 7-27-16 ॥
In every way this rakshasa, swollen with strength and accompanied by his sons, will perform a mighty deed; this has been seen as something inherent in his nature.
english translation