This is a quote from Douglas Adams, the author of The Hitchhiker's Guide to the Galaxy. Adams' also wrote for Doctor Who in the 70s. In the 2011 episode of Doctor Who, "The Doctor's Wife," the Doctor says to Idris (the TARDIS, aka Sexy) "You didn't always take me where I wanted to go." To which she responds, "No, but I always took you where you needed to go."
when we make a change, it's so easy to interpret our unsettledness as unhappiness, and our unhappiness as a result of having made the wrong decision. our mental and emotional states fluctuate madly when we make big changes in our lives, and somedays we could tight-rope across manhattan, and other days we are too weary to clean our teeth, this is normal. this is natural. this is change. - jeanette winterson