In plain words
Even if a person of very wrongful conduct worships Me with undivided devotion, that person should be regarded as righteous, for the resolve is rightly directed.
Word for word
Even if one of very bad conduct worships Me, devoted to no other, he is to be regarded as good indeed; for he has rightly resolved.
अपि चेत् सुदुराचारो भजते मामनन्यभाक्साधुरेव स मन्तव्यः सम्यग् व्यवसितो हि सः
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam
शृणु मद्भक्तेर्माहात्म्यम् —
अपि चेत् यद्यपि सुदुराचारः सुष्ठु दुराचारः अतीव कुत्सिताचारोऽपि भजते माम् अनन्यभाक् अनन्यभक्तिः सन् , साधुरेव सम्यग्वृत्त एव सः मन्तव्यः ज्ञातव्यः ; सम्यक् यथावत् व्यवसितो हि सः, यस्मात् साधुनिश्चयः सः ॥ ३० ॥
In plain words
Now listen to just how great devotion to Me really is —
Even if someone has lived a thoroughly bad life — genuinely contemptible conduct, the worst of it — if that person worships Me with undivided devotion, holding nothing else in mind, you must regard them as virtuous. Truly virtuous. Because their resolve is sound, rightly placed; whatever their past, their determination now points toward the good.
Close to the Sanskrit
Listen to the glory of devotion to Me —
Even if one of thoroughly bad conduct, [that is,] although [one is] of bad conduct, exceedingly, even of contemptible conduct, worships Me, being devoted exclusively, [that is,] having undivided devotion — he is indeed to be regarded, [that is,] known, as virtuous, [that is,] as one of right conduct; for he is indeed correctly, [that is,] properly, resolved, since he is of virtuous resolve.