"Do what thou wilt shall be the whole of the law"

I've been doing a lot of thinking lately about the interconnectedness of all things.
I've been considering things like Samadhi, entanglement, divinity, superposition, how Mandelbrot sets might be a reflection of natural processes and how it is very reasonable to say that existence is One.
I've been considering these things, and I find that the more I consider them the more one question in particular keeps popping up in my mind "if this is the natural state of being why do we usually feel so separate? Why are we given separate bodies, a separate ego, a distinct sense of being an individual when in reality we are merely reflections of the whole of existence? If we are unity why do feel like this?"

I think of these things and one experience in particular keeps coming back to me.

When you start reading anything of Aleister Crowley's you're often faced with a similar question. This idea was something he dealt with very thoroughly. He even devised meditations and exercises to help us comprehend this aspect of ourselves and how this idea can be resolved.
He called it the practice of the magical diary.

The exercise is really simple and really isn't as much work as it looks like at first (who's afraid of work anyway?).
Basically all you do is get a notebook and start writing out your life in as much detail as possible.
You can start by writing out a bit about your family, traditions your family has, your distant relatives, what parts of the world they came from, what kind of work they engaged in, and anything else that seems important.
Then you can start writing about your parents, how they met, what work they do, what are their hobbies, their body types, their humor and disposition, their parenting styles, how they see they see the world and anything else you can think of.
Now you can start writing about yourself.
Be as detailed as possible!
Write out your first memories, write out experiences from school, who your friends were and what they were like, how you liked to play, what interested you, what scared you, your views and attitudes about sexuality, and anything else.
Then as you start writing about yourself as a teen or a young adult (then later as an adult) start including more details about your political views, what books you read, what your personal philosophy is like, what your sex life is like, what you prefer sexually, your attitude towards sex in general (sex is important), your views on religion and how you came to those, who are your friends now, what are your hobbies and literally as much as you can think of.
(something you might find useful is writing on only one side of the page or do it on the computer so that you can fill things in as new memories pop up.)

After completing this exercise (which can take anywhere from a week to a month depending on how many hours a day you put in) you'll be able to read it over and intelligently trace some very obvious currents in your life. You'll find that perhaps as a young child you really enjoyed contact sports and anything martial but because of emotional imprint events those tendencies were suppressed and ended up coming out in your life in unhealthy ways. Or you might find that you've always really enjoyed drawing, ever since your first memories, and you find that some of your happiest memories are from the simple enjoyment of art.

You'll notice these currents as clear as day. They'll be unmistakable.

Then you might start asking yourself "why have I been struggling so hard against these things all my life when it's so obvious that I was born to do this?"

This is where it gets really interesting.
How can we deny that we are living a life with a definite purpose when we can see it so clearly once we gain even a little perspective?
How can we claim that we are not part of some plan when everything seems to fit together so perfectly (even the seemingly imperfect things)?

So I've been playing with the idea that we are not "separate" from this unity arbitrarily or by some fault of our own or of nature but by design.

We are all supposed to be doing something specific, our individuality is a sign of our function, and fulfilling that function seems to be necessary to the fulfillment of the function of the whole.