There is no past and there is no future, there is only now. The everpresent moment which has no boundary; no beginning and no end. Can you point to a beginning of this present moment? When did this present begin? Did it ever begin? Does this present have an ending? Have you even felt an ending? No, it is undying and eternal. It exists without time, for it is truly timeless. All existence of the past or the future is a creation of our beautiful mind. The past exists as guilt and the future as worries. All problems are problems of time and problems in time.
All this I understand. Yet why the memories? This question I have been pondering for some time.
Perhaps it is because without memories, our lives would be like that of a goldfish. A goldfish cannot remember more than 30 seconds of its life. So if it is eating, it thinks it has been eating its entire life. And if it is dying, well then... that poor goldfish thinks it has been dying its entire life. So perhaps, when we are on our deathbed, we can be happy in the memories of our lives and find some satisfaction and peace.