The cessation of separate conscious existence by identification with Supreme Brahma is the highest stage for a living agent to acquire. And since I have never swered from that condition, I am, therefore, called by the name of Achyuta.
निर्वाणं परमं ब्रह्म धर्मोऽसौ पर उच्यते। तस्मान्न च्युतपूर्वोऽहमच्युतस्तेन कर्मणा॥