“Reality is that which, when you stop believing in it, doesn’t go away.” – Philip K. Dick (science fiction author)
The biblical word for reality is truth. As in:
John 8:31 So Jesus was saying to those Jews who had believed Him, “If you continue in My word, then you are truly disciples of Mine;
John 8:32 and you will know the truth, and the truth will make you free.” (NASB)
The truth is that which is true whether you believe it or not.