Karika 64

एवं तत्त्वाभ्यासान्नास्ति न मे नाहमित्यपरिशेषम्। अविपर्ययाद्विशुद्धं केवलमुत्पद्यते ज्ञानम् ॥६४॥

By practising principles this way - "does not exist", "not mine", "not me", "what remains beyond?""; one and only special knowledge, the 'kevalam-jñānam', is produced that is free from error of judgement.