In my experience, confusion is the only suffering. 

Confusion is when you argue with what is. 

When you're perfectly clear,

what is is what you want.

So when you want something that's different from what is,

you can know that you're very confused.

There's no mistake, and there's nothing lacking.

We're always going to get what we need,

not what we think we need

Then we come to see that what we need is not only what we have,

it's what we want.

Then we come to want only what is.

That way we always succeed,

whatever happens

-Byron Katie

From Peace in the Present Moment: Selected Quotations from Eckhart Tolle and Byron Katie