People are not always what they seem. Respect the otherness of the other, and don't be sure you know who they are. It's hard enough to know who you are. And remember that other people are the ultimate drug. As social mammals, we are massively influenced by the people around us, and that influence is on multiple levels that often escape our awareness.

The I Ching puts great emphasis on choosing your companions with care. Avoid associating yourself with people with whom you wouldn't trust your life. You are trusting your life with them. Solitude is preferable to unworthy companionship.