By more grown up i mean more mystical: encouragement of individuals to have their own direct connection to the divine (gnosis), and specific practical methods to facilitate that, without needing an intermediary of a priest, church or an obscure book from a far away land. I think all the religions have esoteric core parts where the simplistic parables are given more nuanced, less literal meanings - you could say this a more 'grown up' version. These esoteric traditions seem to end up with similar ideas and symbols which often amount to practical/mystical methods of achieving 'gnosis' (or enlightenment).
Practical mystical methods as in??? I just want to clarify a few of your points so I can ponder my proper response in a more informed way.
I'm not sure how, from a Christian perspective, one would somehow conjure up the Holy Spirit. Can we make Him somehow manifest Himself by using 'practical/mystical methods' to summon Him? This is the Sovereign Creator of the cosmos. King of Kings?
Does that not seem a little irreverent?
I couldn't really tell you what gnostics think about grace specifically (it was probably in all that stuff about 'emanations'); and i was just riffing on various gnostic traditions in that paragraph - though there are definite suggestions of reincarnation in some gnostic beliefs, especially where they were influenced by neoplatonism or pythagoreanism. (sorry, i'm not really sure i can even do nutshells

(coconuts maybe) - i'm just enjoying reading up on it again)
I'm not sure what the gnostic perspective would be on Grace either. A less esoteric Sunday School way of understanding it is in this acronym...Gods Riches At Christs Expense. Eg: He wants to give us the Kingdom, unmerited favour, forgiveness of sin and adopt us into His family for believing in His Son.
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That was a nice quote from The Gospel Of St Thomas. I really need to research Gnosticism at some point and also ponder that more considered response to your previous questions. :D
I couldn't requote the quotes on this either. Learning how to do that is also on my todo list lol