(Click on the picture above for the video described below)
Today's topic is on the idea that friendship is based on the idea of choosing a person as a friend that makes a difference in one's life and in essence through 'Selfish" means. This applies to both sides and thus a mutual benefit. The benefits being laid on the self to choose be it physical or mental. Thus, the virtue of sincerity, which one argues of friendship is based on the self and not like in most people's mind, the sincerity of the other.
This is a old topic that was written in the author's Blog 'The Simplicity of Logic' in 2011 (links provided below).
Till next word...
The Simplicity of Logic Blog's written article on this subject written in 2011 : http://simplicityoflogic.blogspot.sg/2011/10/friends-sincerity-of-who.html
The Simplicty of Logic's Youtube Page: http://youtu.be/3ELKvR4sm2c