Perfect love, we know, casteth out fear. But so do several other things – ignorance, alcohol, passion, presumption, and stupidity. It is very desirable that we should all advance to that perfection of love in which we shall fear no longer; but it is very undesirable, until we have reached that stage, that we should allow any inferior agent to cast out our fear. 

C. S. Lewis

Lewis said that there are few things that can make his blood boil, but if I ever go out with Mike, that will anger him very much.