??
If you really want to study the subject try
this or text version starting
here. Or a very brief into to the subject (from a non-Chabad source)
here.
Now, some might say what's the connection to Titus? IMHO it's a question of what reality is all about, is it what we see with our eyes, or what we understand (or know) to be true?
But to touch on the topics very briefly, to the uninitiated. The Gemara in Gittin 56,2 tells of how Titus stabbed the Paroches with his sword, it started bleeding וכסבור הרג את עצמו. So what is the true reality, what Titus witnessed, or was it some kind of העלם והסתר that נורא עלילה על בני אדם created?