Association: a pure devotee can associate with anyone

Once I was giving Prabhupada a message, and he had just woken up. He told me that he had just had a dream. He dreamt there was a big kirtana party. He said, "Gradually as the chanting was going on, the non-chanters, the non-devotees were gradually coming and joining the chanters (the devotees)." I asked Prabhupada if any of the chanters had become non-chanters. If any of the devotees go and join the non-devotees. He said, "How can that be possible? Their name is already written in Krishna's book for going back home, back to godhead." 

Whatever you hear, that is what will come out naturally when you speak. So if you make a habit of hearing more and more about Krishna, what comes out will also be about Krishna.

[We are told] we should not associate with worldly minded persons who are not in Krishna consciousness. So what do we do with this? We have to associate. You have family members who are not Krishna conscious. If you have a job, there are so many people who are not Krishna conscious - practically almost all the people in the world - but that doesn't mean we have nothing to do with them. This depends on how advanced you are.

A pure devotee can associate with anyone, and just by their influence the person becomes favorable to Krishna. I have seen my god-brother Kesava Bharati. He calls to arrange to make his travel arrangements, and through the course of the phone call he somehow makes them so favorable, and sometimes even starts preaching about Krishna. If we are very friendly with everyone, that will give a good influence to everyone.

The point is that you should associate with someone else who is not a devotee if you can influence them in a nice way. That may not even be that you can talk about Krishna. You can just be nice, and persuade them in good qualities.