Bhishma said A person who is born of an irregular union shows various features of disposition. One's purity of birth, again, is to be determined from one's acts which must resemble the acts of those who are admittedly good and pious.
भीष्म उवाच योनिसंकलुषे जातं नानाभावसमन्वितम्। कर्मभिः सज्जनाचीर्णैर्विज्ञेया योनिशुद्धता॥