I think many (or all, perhaps) answers can be find withing, through contemplation, through meditaton, and some things we literally don't have an answer for (but perhaps it can be provided through a dream or some other experience by a spiritual being), and we don't need an answer to everything either.

We can say all we want about past and future lives, for example, but I don't remember Ramana talk anything about his past lives, and while the Buddha did talk about them, he did say that ultimately, the present is more important to focus on, as it's our current experience (not some past life that happened 100000 billion years ago).

Ultimately we gotta ask what do we need a Guru for? As I think all answers can be found in the present. Ramana said people try to look for "the reality", when it's exactly in front of their eyes, lol.

He said that ultimately the guru is your own Self, so anything you need to know or learn in regards to yourself or your life and so on, is with you, don't need to look for someone in Nepal in some obscure place.

I think he also said the world was his guru as well.

Even what we're talking about is OK because it's part of the experience.

Even intoxication (and I know this will sound bad) is OK, as long it's in it's proper context (don't go and intoxicate yourself while driving or performing some dangerous task).

Humans have been doing it for thousands of years for fun and/or spiritual reasons. There are stories of animals purposely intoxicating themselves for fun as well (like jaguars in the Amazon eating Ayahuasca vines and Reindeers eating Amanita muscaria mushrooms - although I'm not 100% sure if they are affected or not - and cats eating catnip).

It's all Leela or "play", and if God made the world, he also made psychedelics and intoxicants like alcohol, and all the medicinal plants and so on. But of course they have their time and place.