You already have the key:
Everyone already knows their design,
And at length their authority.
how not? It's after all, you.
You may need to act in harmony with who you are,
But it's not the same as not knowing who you are.
Even the undefined centers are known to some degree,
As much as we all know our behavior changes slightly depending on who we are.
Really, every person knows what his authority is and how it works.
Many people mingle in life just fine,
Without Human Design and living their designs correctly without this knowledge.
That does not mean that life is a piece of cake,
And decisions can be easier to make if you understood the mechanics,
But you already have the key to everything you need inside you.
In describing these powers we have dismantled,
In a sense, artificially something whole.
It's like disassembling an engine to see how it works.
You disassemble it, unfold all the parts,
Looking at how they fit, and what they do.
But then all you have,
It's a bunch of parts on the floor that do not do what an engine needs.
Internal authority is not like a small person in a control center,
It is woven into our entire design.
The design is complete, not a bunch of small, separate pieces.
We look at what we call the parts,
But what we strive to understand is the integrity of the design.
People live their designs in many ways.
Through the self, through the self, alone, with others.
The descriptions of the behaviors here are not simply statements about "what should be",
But statements about "what is there."
This is not a rulebook for what people "should do",
It's a description of what people, in general, are "doing" (Doing Mode).
Some people do it consciously, some do not.
Some people exercise their authority,
some are afraid to do so.
Some trust their authority more than others.
Some have been tempted (conditioned),
to rely on authority for which they are not connected.
With internal authority, you can think of it in terms of transportation.
There are many transportation methods that people use.
We can walk, ride a horse, take a train, ride a bike or swim.
Everyone works to bring us from one place to another.
But if you ride a bike,
You do not make decisions like you would in a car or on a plane.
When you look at the world,
You see people using all of these different modes of transportation,
And it's the same with internal authority.
There are different ways depending on your unique design.
No one is great.
One works better for some,
And another works better for others.
When someone says something like
"contact your feelings".
Or, "Trust the gut." Or, "Trust your instincts",
It's not inaccurate,
And it may work for millions of people - but it may not work for you.
If your authority is emotional,
So you're wired to wait for the wave,
If your authority is spleen you are built to decide spontaneously.
With the authority projected on yourself you hear,
your decision at the same time as everyone else is making it.
When it comes out of your mouth.
With ego authority you are here to claim your ego.
These are all different ways of driving, 
epending on what vehicle you have.
You can not know in advance,
what will be the consequences of making your decision from your authority or,
For that matter, what might they be if you do not get it from your authority.
What you can know is that you have made a decision from your authority,
It is reliable in terms of your design.
We can all count on our wiring.
There is no belief or discretion in this.
You do not have to believe in anything presented.
All systems are logically consistent.
If you want, you can try it,
Check it out,
Enjoy it,
Investigate it.
This is not something you should blindly accept or reject.
Look at your world through this lens,
And saw what he looked like.
So jump in and see what happens!