A presupposition ceases to be only that, once it finds a root in reality, while a starting place that strains but never finds affirmation is but a dream. Those starting thoughts that end in the bedrock of objective reality are pieces to the giant map that all men wish to see whole. The glimmer within that bounces off all things and reflects back the image of the one cause, the initiator. When a presupposition is confirmed, it no longer remains a pre-thought, but flourishes into confirmed sight. Like two men walking up to a cabin with light visible within. One may presuppose that a fire has been started and the other that lanterns have been lit. Both have an idea of how the light source exists, but only one presupposition will be confirmed, with the other easily abandoned.
