I think the mind that is in touch with it's source is balanced and clear. When the body, mind and spirit work in conjunction, I think the whole being benefits.

I can't say I've noticed the correlation between level of intelligence and level of clarity. And I think people of all levels of intelligence are subject to bouts of depression.

Here is a quote from one of my favorite movies. A grandmother explaining to the kids about the up and downs of life. Now I don't know if it's smart minds that have a bigger struggle with depression or smarter and creative people. I'd rather have the excitement than a uneventful life.

The movie is Parenthood (1989) and she says:

Grandma: I always wanted to go again. You know, it was just so interesting to me that a ride could make me so frightened, so scared, so sick, so excited, and so thrilled all together! Some didn't like it. They went on the merry-go-round. That just goes around. Nothing. I like the roller coaster. You get more out of it.

I believe it is often the strongest people that have the darkest demons.

"The distance between insanity and genius is measured only by success."

That being said, there are no absolutes. Some geniuses are completely level headed, while others are barely a hop away from insane.

The stronger someone becomes, physically, mentally, or spiritually, the more important it becomes that they must maintain balance. As you fall further and further out of balance the more risk you have of becoming injured. (Bear in mind that not all injuries are physical, or even visible. You can injure your spirit or your mind just as easily as you can skin and bone.)

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**[Below was edited in to address a comment]

I agree that everyone has a positive and negative side, and that they both grow together... That's actually exactly what I was saying, perhaps I need to be more clear with my writing.

My first sentence is meant to imply that everyone has demons, but as people's bright sides grow so do their dark sides. I believe that everything in life is a balance of opposing forces that rely on one another to survive. You cannot have one without the other, and the absence of one will lead to the destruction of the other.

I believe that is a large influence on why many brilliant people commit suicide. As they grew as a human they were expanding both their light and dark sides; but they did not exercise their dark side, so they lost control and it consumed them.

My interpretation of that quote is what makes a genius so 'genius' is the fact that they were insane enough to believe that they could turn a crazy idea into a reality, and they succeeded.

The last paragraph discusses the simultaneous growth of opposites, and the fact that if you try to force one side to grow without the other it causes the weaker to fight violently to restore balance, and causes the stronger to be more vulnerable to injury.

A great physical example of this is strength and flexibility in your muscles. If you train only strength you will be slow and vulnerable to impact as it will pull a muscle or even tear it if the impact is severe enough. If you train only flexibility you will be frail and vulnerable to impact because your muscles aren't strong enough to withstand the force. When you have a perfect balance of both you are capable of moving faster, more resilient to injury, you heal faster, have more energy, etc.

[Another edit]

In response to "Do not judge...", absolutely, a great quote. I assure you that I am very aware of and comfortable with my insanity. I never intend for anything I say to be used as an encouragement to make judgement in a negative, authoritative, or offensive manner.

i'd have to say that clarity is mostly dependent on the purity
of the instrument or vehicle perceiving,
if this is what you mean by strenght