My biggest fear is lack of love. It might be called fear of loneliness in the deepest sense (not as physical solitude, but as the impossibility to share yourself with other person. Closely and intimitely.) I also fear cruelty of any kind especially refined emotional violence. It could be in the form of indifference to the feelings of others or to the beauty of the world. Or in the form of ignorance - a kind of self-sufficient attitude when you don't even try to understand the other or to undesrtand that you are limited and could be more.