In plain words
People of āsuric nature do not know pravṛtti or nivṛtti. Neither purity, good conduct, nor truth is found in them.
Word for word
People of āsura [nature] know neither engagement nor withdrawal; neither purity, nor even conduct, nor truth is found in them.
प्रवृत्तिं च निवृत्तिं च जना न विदुरासुराःन शौचं नापि चाऽऽचारो न सत्यं तेषु विद्यते
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam
आ अध्यायपरिसमाप्तेः आसुरी सम्पत् प्राणिविशेषणत्वेन प्रदर्श्यते, प्रत्यक्षीकरणेन च शक्यते तस्याः परिवर्जनं कर्तुमिति —
प्रवृत्तिं च प्रवर्तनं यस्मिन् पुरुषार्थसाधने कर्तव्ये प्रवृत्तिः ताम् , निवृत्तिं च एतद्विपरीतां यस्मात् अनर्थहेतोः निवर्तितव्यं सा निवृत्तिः तां च, जनाः आसुराः न विदुः न जानन्ति । न केवलं प्रवृत्तिनिवृत्ती एव ते न विदुः, न शौचं नापि च आचारः न सत्यं तेषु विद्यते ; अशौचाः अनाचाराः मायाविनः अनृतवादिनो हि आसुराः ॥ ७ ॥
In plain words
Right through to the end of this chapter, the demonic disposition is being laid out for you -- not as an abstract idea but as something that marks particular people. Once you can see it clearly, in the open, you can let it go.
Pravrtti -- engagement -- means setting out to do what should be done, in pursuit of a genuine human good; that's pravrtti. Nivrtti -- its opposite -- means pulling back from whatever causes real harm; that's nivrtti. Demonic people simply don't know either one. And it isn't only these two they're blind to: purity isn't in them, decent conduct isn't in them, truthfulness isn't in them. They are unclean, ill-behaved, full of deceit, and habitual liars -- that is what it means to be demonic.
Close to the Sanskrit
Up to the completion of the chapter, the demonic disposition is being shown as a characteristic of particular living beings, and by making it directly perceptible, it becomes possible to accomplish its avoidance --
'Pravrtti' -- that is, engagement -- that on which one engages, as a means to a human end, in what is to be done: that is pravrtti; and 'nivrtti' -- the opposite of this, that from which, being the cause of harm, one should withdraw: that is nivrtti -- these, demonic people do not know, do not understand. It is not only pravrtti and nivrtti that they fail to know; purity does not exist in them, nor conduct, nor truth; demonic beings are impure, of bad conduct, deceitful, and speakers of untruth.