The traditional conception of the life says to us that it is impossible to modify the past and if it is analyzed from a logical point of view seems that thus it is, but at spiritual level considerations deeper exist than they say to us that if it is possible to modify the past. Insofar as you keep silence and enters a deep state of meditation and oration will notice as the time tends to stop itself and is that in fact the time is a concept of the mind, all the spiritual lessons will say to him that in fact the unique thing that it exists is " here and ahora" , then one of the great secrets to obtain the illumination is to surpass the illusion of the time. In the book I Am Happy, I Am Rico de Andrew Corentt explains in detail the form to us in which the mind perceives the time, through study of this book you you will understand because you are possible to modify its past and she is doing in fact always it of some form mainly from personal experiences, still is possible to modify experiences with other people but that demand an energy extraordinary but it is possible and exist documented cases that thus it has happened. Andrew says us to Corentt that many people obtained great changes simply modifying their past through the imagination, the key is in remembering that the mind does not distinguish between past, present, future and visualization for example if you concentrate yourself as if she was in disease state will see as the body responds to that idea exactly, feels been annoying, feels pain, etc. how he is possible that? It is it because the mind is manipulable, but it does not interest to us to recreate a disease state, but it interests to us to obtain fabulous things in our life.