The future: a dark, desolate world. A world of war, suffering, loss on both sides. Mutants, and the humans who dared to help them, fighting an enemy we cannot defeat. Are we destined down this path, destined to destroy ourselves like so many species before us? Or can we evolve fast enough to change ourselves... change our fate? Is the future truly set? The past: a new and uncertain world. A world of endless possibilities and infinite outcomes. Countless choices define our fate: each choice, each moment, a moment in the ripple of time. Enough ripple, and you change the tide... for the future is never truly set.
Prof. Charles Xavier/Professor X (played by Patrick Stewart, X-Men: Days of Future Past (2014), screenplay by Simon Kinberg