Anything for which you are not prepared - it may be bliss, it may be joy - will be so intense in the beginning that it is bound to appear just like pain. You are well-acquainted with pain - you know it; that is the closest experience.
When love comes to you without asking, and when love comes from a source which you have never expected, never thought of, never hoped for, you never had the idea that you deserve it or you are worthy of it... But when you come across somebody who is love, the whole ocean has poured into your heart. It feels as if you are bursting, dying. It is immensely painful. But at the same time you can feel the distinction. It is very close to pain, but it is not pain.
Your being understands things which your mind does not understand.
-Rajneesh