Your Reality is Relative to you alone.
Why is this important to consider?
Because it is very easy to believe that our reality is obviously the correct version.
Here's an illustration...
Grass is green.
But for those who are colour blind, this is not their reality.
Whose reality is correct?
Maybe grass is actually red?
Everything is like this. Everything is perceived uniquely - sometimes radically so.
We may not agree with another person's reality - but it is real to them - and to accept this causes us to become more understanding - and start to loosen our grip on our ingrained belief of correctness.