Our past is a soil upon which vegetating future. If a gardener - our present - has knowledge and skill, this garden will be blossoming, if not - abandoning and overgrowing by weeds.
So skillfully editing our past, trading negative emotions for strong positive reactions, planting a good seeds and healthy intentions - after plucking out weeds, old withered staffs with roots, - nurturing and fertilizing ground, we can transforming our reality, present and future.
Of course, who controls past, controls future too.