Bhagavad Gita Verse 7, Chapter 16

pravrittim cha nivrittim cha janaa na viduraasuraahaa |
na shaucham naapi chaachaaro na satyam teshu vidyate || 7 ||
 
Whether to engage or to disengage from action, those people with devilish tendencies do not know. Neither purity nor proper conduct nor truth exists in them.
 
pravrittim : engaging in action
cha : and
nivrittim : disengaging from action
cha : and
janaahaa : people
na : not
viduhu : know
aasuraahaa : those with devilish tendencies
na : not
shaucham : purity
na : not
api : also
cha : and
achaaraha : proper conduct
na : not
satyam : truth
teshu : in them
vidyate : exists
 
Shri Krishna begins his explanation of the materialistic viewpoint by examining its value system. He says that those people who come from a purely materialistic viewpoint have a shaky value system. In other words, they do not know what to do and what not to do, when to engage in something and when not to. They focus only on artha or wealth and kaama or desire. They forget that there are two other goals in life, dharma or duty and moksha or liberation, and that each goal is to be picked up and left off at a certain stage in life.
 
Now, since such people are unclear about the pros and cons of everything, they are bound to do things in a haphazard and messy way. Shri Krishna says that such people do not have shaucha, they do not have purity. He refers not just to external purity but also internal. When someone does not have a systematic way of thinking through things, there is a strong chance that they will lead messy lives. Furthermore, their conduct towards others, their aacharana, will also be messy and haphazard. They will lack good manners, courtesy and politeness.
 
It also follows that when someone does not know the pros and cons of anything, they will not place a lot of importance on satyam, truth, doing things the right way. So if they do not get the result they want, they have no qualms in getting their results by lying, cheating and deceit. They do not want to wait for the result, because waiting takes time. If there is a shortcut, they will go for it. Such is the value system of the aasuri, the devilish, the materialistic viewpoint.