True devotees of the Lord are wholly absorbed in Him. They have surrendered to Him and through single-minded devotion they are granted the power of discrimination, the discrimination that leads them from the unreal to the Real. Krishna emphatically declares that ignorance is destroyed and knowledge is gained through Divine Grace alone.
To them who are ever steadfast, worshipping Me with love, I give the yoga of discrimination by which they come to Me. (10:10)