So , Vedas has 4 major layers to it : 1) Samhitas (the mantras, etc recited dedicated to demi gods) 2) Brahamanas (commentaries) 3) Aranyaka (lit. "forest" ) 4) Upanishads (lit : 'upa': near , 'ni' : down , 'shad' : sit ; "Sit down near a teacher (to gain knowledge)) I was reading one called "Brihadaranyaka upanishad" .lit. "Brihad" : very big, "aranyaka" : forest, perhaps the world forest . Actually the pdf I have is more of a 'katha' on the upanishad itself by Swami Krishnananda Saraswati of divine life society. It talks really strange or should I say SURREAL things . What you see is not real , what you don't see is the real thing. Talks of atman / brahm and talks like where does consciousness go when we sleep. I can't really describe all the deep stuff (deep but non-verifiable stuff it talks of) as I don't want to give in details and have only studied superficially. According to it, soul (self) goes and touches the god (universal self) and thats why we feel refreshed on waking up . And that everything in dreams is made of mind ('mann') itself and the mann then enters the studio of dream world and enjoys what it can't enjoy in waking world. Its very mystical things , although I haven't read it full because the speaking sage of the upanishad (Sage Yajnavalkya) talks too much of the demi-gods and this and that before coming to his point (one god) which he identifies the same as 'self' in every being. I don't think its really contradicting with gurbani , infact quite similar to sikh philosophy. What do sangat here think ?