What is the theory of wahdat ush shuhud?

Wahdat ush Shuhud means that in all objects the Light of Almighty Allah is transmitting. The being of all objects is due to the Mercy and Grace of Almighty Allah. Not object in itself is existing.

On the other hand some of the Sufies believe that Almighty Allah Himself is present in all objects. Hazrat Mujaddad Alf Sani refuted this belief and presented the theory of Wahdat ush Shuhud.