The more ready you are to leave behind all that you have experienced, in order to be able to go towards something better and higher, the faster you will go; the more you drag the heavy weight of all the past which you do not want to get rid of, the slower is your advance.
All the past should always be simply like a stepping-stone or a ladder, something to lead you farther; it should not have any other use except to push you forward. And if you can feel this and always turn your back on what is past and look at what you want to do, then you go much faster, you do not waste time on the way.
What makes you lose time is always this clinging to what has been, to what is, what seemed to you beautiful and good in what is past. This must only help you, you must not reject it, but it must help you to go forward, it must simply be something on which you lean to take a step forward.