We know no more than the ancients; we only know other things, but nothing in which is an assurance of perpetuity, and little that is truly wisdom.

And yet all I have said is but from common reading. And, let me ask, why, because we know but little, we are to be supposed to know nothing?

All we can know is that we know nothing. And that's the height of human wisdom.

All I know is that I do not know anything

The only thing I know is that I know nothing, and i am no quite sure that i know that.

I know nothing except the fact of my ignorance.

We can never know anything.

I know nothing.

I only know that I know nothing

We know so very little about this strange planet we live on, this haunted world where all answers lead only to more mystery.

Our discreditable secret is that we don't know anything at all, and our horrid inner secret is that we don't care that we don't.

One thing only I know, and that is that I know nothing'.

We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power.

How it is we have so much information, but know so little?