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SB 11.20.36

na mayy ekānta-bhaktānāṁ
 guṇa-doṣodbhavā guṇāḥ
sādhūnāṁ sama-cittānāṁ
 buddheḥ param upeyuṣām
Synonyms: 
na — not; mayi — in Me; eka-anta — unalloyed; bhaktānām — of the devotees; guṇa — recommended as good; doṣa — forbidden as unfavorable; udbhavāḥ — arising from such things; guṇāḥ — piety and sin; sādhūnām — of those who are free from material hankering; sama-cittānām — who maintain steady spiritual consciousness in all circumstances; buddheḥ — that which can be conceived by material intelligence; param — beyond; upeyuṣām — of those who have achieved.
Translation: 
Material piety and sin, which arise from the good and evil of this world, cannot exist within My unalloyed devotees, who, being free from material hankering, maintain steady spiritual consciousness in all circumstances. Indeed, such devotees have achieved Me, the Supreme Lord, who am beyond anything that can be conceived by material intelligence.
Purport: 

The words buddheḥ param indicate that the material modes of nature cannot be found within a pure devotee absorbed in the transcendental qualities of the Lord. In the Second Chapter of Bhagavad-gītā, Lord Kṛṣṇa clearly explains that a pure devotee is recognized by complete detachment from personal desire; therefore, a pure devotee constantly engaged in selfless service to Lord Kṛṣṇa may not always observe the innumerable details of Vedic rituals and regulations. Such occasional negligence is not to be considered a transgression. Similarly, observance of ordinary material piety does not constitute the ultimate qualification of a soul surrendered to God. Love of Kṛṣṇa and absolute surrender to the Lord’s will raise one immediately to the transcendental platform, where activities performed on the Lord’s behalf are absolute, being an expression of God’s will. Ordinary materialistic persons sometimes falsely claim this exalted status for their whimsical, immoral activities and cause a great disturbance in society. However, just as an ordinary person should not falsely claim the executive privileges of the personal assistants of a national leader, similarly, an ordinary conditioned soul may not foolishly claim that his immoral, whimsical or speculative activities are sheltered by divine right, being the will of God. One must actually be a pure devotee of the Lord, empowered by the Lord Himself and completely surrendered to the will of the Lord, before one may be accepted as transcendental to ordinary piety and sin.

There are cases of highly elevated devotees who momentarily fell down from the saintly platform of devotional service. The Lord instructs in Bhagavad-gītā (9.30):

api cet su-durācāro
 bhajate mām ananya-bhāk
sādhur eva sa mantavyaḥ
 samyag vyavasito hi saḥ

A momentary falldown by a sincere devotee of the Lord cannot change the Lord’s feelings toward such a person. Even an ordinary father or mother quickly excuses a momentary transgression by their child. Just as children and parents enjoy mutual love, the Lord’s surrendered servants enjoy a loving relationship with the Lord. An unpremeditated, accidental falldown is quickly excused by the Lord, and all members of society must share in the Lord’s own feelings, excusing such a sincere devotee. An advanced devotee should not be branded as materialistic or sinful because of accidental falldown. A devotee immediately returns to the platform of saintly service and begs the Lord’s forgiveness. However, one who permanently remains in a fallen condition can no longer be accepted as a highly elevated devotee of the Lord.