Verse 6

6.  What is not at the beginning and at the end,  is so also in the present;   existing things,  though similar to illusions are noted as though real.

"What is not at the beginning and at the end"

This is describing all entities which come into being or take up a form  (which means they change states).  Then again eventually decay,  mutate,  suffer entropy and die.

"is so also in the present"

If an entity lacks permanent existence  (is therefore ultimately unreal)  due to having a beginning and an end,  it must also therefore be unreal in the present.

"existing things,  though similar to illusions are noted as though real"

Even though an entity can be perceived as existing in the present,  it should have been noted that such entities will prove,  because they have previously been noted to have been proved,  to be unreal.

Ultimately,  all that has come into being will without exception go out of being,  for this reason all is proved unreal.  This is what is being said.  All objects of perception in all states suffer this same unreality of being which is proved by their impermanence.  Therefore all objects perceived in the present,  all of which had a beginning,  although noted as real to the senses are proved to be transient through reason and logic so are consequently unreal.