Bismillahi rahmani raheem, assalmau alaikum.
فَتَعَالَى اللَّهُ الْمَلِكُ الْحَقُّ لَا إِلَٰهَ إِلَّا هُوَ رَبُّ الْعَرْشِ الْكَرِيمِ
The Prophet Muhammad (saws) said, “I have one face looking at the Creator and I have one face looking at Creation,” and “I have one hour with the Creator and I have one hour with the creation”. Those who have the Barzakh removed from their sight always see the spiritual world and its creatures, it is here you find the face of Allah and His hand in the universe.
The face looking at Allah is the prophets inner sight, some call this your mind’s eye but that is not accurate since it is your spiritual heart doing the seeing just like your eyes see and your mind process’s the images, the other Face is the one that sees the normal world.
When Allah removes the barzakh from you your sight of ghayb is persistent, constant, which is why the prophet (saws) called it a face like his normal face that sees the world, it is an expression in Arabic a way of talking scientifically in a time and culture where the world did not know science.
Most spiritual people who have experiences and even most Awliyah don’t have the Barzakh removed from them so they can’t properly call it their face, they have glimpses, images of things from that world your spiritual sight is only perfected when Allah removes it from you and only He can do it because that barrier upon your perception if you approach it, it will cause insanity, scramble your perception until you can’t make sense of the world (the definition of insanity) that is its job and purpose.
While you can train yourself to perceive spiritually no amount of training will remove the Barzakh from you, that is like attempting to switch of physics, only Allah can remove it and it is only done for a few even among the Awliayh when their hearts reach the Arsh, because the Arsh is responsible for Haq in the universe and every meaning of that word.
So it is not just responsible for Truth and Justice but also our individual Realities, therefore before this point Allah trains your heart to be able to encompass people’s different realities as well as His many creatures, if you can’t handle it and the majority of people can’t you will be lost in their worlds when you see them, unable to rise above them and encompass their meaning, shape and form.
This quality/ability is necessary because spiritual creatures will dominate your nafs if you can’t encompass what they are and how they exist, so the Barzakh is a protective barrier for mankind which is why Allah placed it on Sayidnah Adam (as) only after Iblis tricked Him (ra) and His wife (as), to protect them from Jinn.
Shaykh Rami Al Rifai.