स्वल्पमप्यन्तरं कृत्वा जीवात्मपरमात्मनोः ।योऽवतिष्ठति मूढात्मा भयं तस्याभिभाषितम् ॥ ५२ ॥
In plain words
Hold on to even the smallest gap between the individual self and the Supreme Self, keep standing there, and you are a deluded soul — and fear, it has been declared, is yours.
Close to the Sanskrit
Having made even the slightest difference between the individual self and the Supreme Self, he who remains so — a deluded self — for him fear has been declared.