Everybody can understand what resonates with his/her level of consciousness. No matter how much we would try to explain some people fundamental truths that we believe in the will simply not understand. That doesn't mean we should stop spreading that valuable information we have. From time to time there will be some souls that understand what we are talking about, but not everybody. I remember when I was so trilled after reading Nisargadatta Maharaj's book *I am that* and talking about his teachings with as many as I could. There were some who got a glimpse about his teachings and started also reading it and other books similar to it, but most would continue with the normal stuff they do everyday for the rest of their life. It's good that you share your knowledge on philosophy and psychology, but don't expect too many to understand your point of view.