यावद्वा यत्किन्चिद्विष दोषस्फ़ुर्तिरस्ति चेद्येहे
कथमारोग्याय भवेत् तद्वदहन्तापि योगिनो मुक्त्यै

How can one be healthy if there is even a trace of poison in the body? So also is ahamkara in respect of the the liberation of the yogin.

Sri Sankarachary's Vivekchudamani (304)