Brahman is all there is. Self is Brahman. Or simply put, God Is !
If He alone is, what can one experience but Him ? Normally, when we think about experiences, we think of the sights that we see, the sounds that we hear - always about things that are external to our body. Even if one is following a faith based or devotional approach, one can cultivate this line of thinking that whatever one sees, hears, touches, smells or tastes, is nothing but He, irrespective of what the mind might believe.
However, if He alone is, then what about the eyes that see, or the ears that hear ? They can't be anything but He. Your body that you experience can also be nothing but He. The thoughts, feelings or emotions that you observe can also be nothing but He. In fact, everything that you can ever experience is nothing but He, Self, Brahman.
Remember, what you experience is not just external objects, but your own body, thoughts, dreams etc. If He alone is, then He is all that you can experience, regardless of what the mind or thoughts present Him as.
If you spend some time in self-inquiry, you can then safely ignore all distracting thoughts, noises etc, by knowing that they are nothing but He. By not paying attention to appearances and knowing that all is He, you will make significant progress in finding peace.
The final question you'd need to find an answer to is quite simple - If He alone is, and it is He alone that you can experience, who can you be ? Could you stand apart from reality and say, 'Look, that is Reality, that which alone is ?' Then you wouldn't be real, would you ?
Could you stand apart from Him and say God Is ?
