When asked to explain the theory of relativity to a layperson Einstein replied, “If you sat on a hot stove for 5 minutes, it would seem like an hour. If you talked to a beautiful and charming woman for an hour it would seem like 5 minutes. Thats relativity.”
In other words, nothing is true, rather it is experiential.
A similar story from the great and holy, wise and knowledgably mystic, Rabbi Menachem Mendel Schneersohn of Lubavitch proves this point, however even better. In the olden days a man once was traveling in his wagon through a forest. There bandits attacked his passengers – he was a wagon driver – bravely, to save his passengers he fought them off, but sustained terrible injuries of which he died from. Getting to heaven they didn’t know how to reward him. On one hand he gave his life for his passengers, on the other hand he was a simple peasant-type wagon driver. What kind of reward would the mystical secrets enjoyed in Heaven be for this man?!
So they put him in a dream world and he truly believes he is there and there in the dream world he was given the finest stallions money could buy, the nicest horses, the fastest steeds, and attached to it was a wagon that emperors would kill for. And so my dear friends this man truly enjoys his reality!
The matrix sort of sums up our universe!
So this doesn’t mean that nothing is real.
What it does mean is that what we experience is only what we experience; it simply is not real.
So what is real?
The only thing that we can say is real is G-d Goodness and Kindness.