" our memories of our experiences, including memories of past thoughts and feelings, are also a matter of degree. They are on a scale of weak to strong. So it seems reasonable to say that our weak memories constitute less of our personal identity than do our strong memories. Likewise, our convictions and tastes. In short, it is an illusion to think of identity as a static, absolute phenomenon as we usually do because ultimately identity is a matter of degree—it’s all relative. When my wife says to me, “You aren’t the man I married,” Parfit would say that she is on to something. At some point, in fact, if I became more Garbo than Danny, she would definitely have legitimate grounds for leaving me—well, not exactly leaving me. "

― Daniel Klein , Every Time I Find the Meaning of Life, They Change It: Wisdom of the Great Philosophers on How to Live