To redeem the past and to transform every ‘It was’ into an ‘I wanted it thus!’ – that alone do I call redemption! Will—that is what the liberator and bringer of joy is called: thus I have taught you, my friends! But now learn this as well: The will itself is still a prisoner. Willing liberates: but what is it that fastens in fetters even the liberator? ‘It was’: that is what the will’s teeth-gnashing and most lonely affliction is called.
Nietzsche
Albert Einstein taught us that space and time belong together to a common entity: space-time. This means that time becomes a dimension, similar to space, and has profound consequences for the nature of time. Most importantly it leads to what has been called the block universe, a universe in which all moments of time exist the same way together. The future, the present, and the past are the same, it is just our perception that suggests otherwise.