yato vaacho nivartante apraapya manasaa saha

lord krishna is the anant guna poorna parabrahma swaruupa is a proven fact by shastras, vedas etc.,, and also accepted fact by all the deities like goddess jagat janani lakshmi ammvaru, jagat pita chaturmukha brahma devudu, pralaya karta lord shiva (ganga dhara) and all other devatas , rushulu etc.,.  this we can know by their statements which we can see in all puranas, vedas, mahabharata etc.,, not only this lord krishna himself admits and proves that he is the only parabrahma swaroopa the all-mighty, no one else is mightier than him by saying

 మత్తః  పరతరం న అన్యత్ కించిత్ అస్తి ధనంజయ, by all the acceptable verses in shastras is the one which we should follow, tasmaat shaastram pramaanam te karya akaarya vyavasthitou. 

so all the shaastra aadhaaramulu prove that there is only one guna poorna brahma that is sri man narayana, there is no other brahma which u referred as nirguna brahma, or the light like thing, what ever we say or do upasanam it should be accepted by shastra, what we think or do is not important, what the moola shastra or  scriptures say or prove is most important. such a thing is to be followed.

shastra (ITAREYA UPANISHAT AND OTHER PRAMANAMULU)  says that nirguna brahma upasana will bring anartha also,  

ANJANEYA,PRAHLAD, DHRUVA AND MANY OTHER BHAKTAS LIKE NAARADA MAHARSHI ALSO HAD SEEN AND EXPERIENCED THE ANANTA GUNA PARIPOORNA BRAHMA SWAROOPA, NOT NIRGUNA BRAHMA SWAROOPA. SO, THEY ARE THE REAL GUIDERS IN ADHYATMIKA MAARGAMU. they have seen saakara brahma with hands, legs and all other senses and rupamu.

veda and all other shastra can't explain parbrahma completely, this does'nt mean that the vedas and other scriptures explain nothing about parabrahma, they do explain some of the qualities of parabrahma, if they nothing explain about parabrahma then they will be use less. in brief vedas, puranas and all scriptures do explain many things related to parabrahma but completely in whole some they can't explain everything of parabrahma. this is the meaning of the vedic verse 

yato vaacho nivartante apraapya manasa saha (tittyriya upanishat)

नरसिंहाचार्य सुळिभावि
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