I sometimes think that when we imagine we know something, that it's mostly conjecture, and that it actually diminishes the world and the animals around us when we imagine that we know what they're about. A more open mind is called for. We're very limited. We have very limited minds. Our equipment for understanding the world is not very evolved.

We fear what we don’t know.

we are suffering from a plethora of surmise, conjecture, and hypothesis.

In order to determine whether we can know anything with certainty, we first have to doubt everything we know

Why do we know what we know and why don't we know what we don't know? What should we know and what shouldn't we know? How might we know differently?

We know accurately only when we know little; doubt grows with knowledge.

To know and yet (think) we do not know is the highest (attainment); not to know (and yet think) we do know is a disease.

All our knowledge brings us nearer to our ignorance.

The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know; our knowledge of our ignorance. For this indeed, is the main source of our ignorance - the fact that our knowledge can be only finite, while our ignorance must necessarily be infinite.

It takes considerable knowledge just to realize the extent of our own ignorance.

It is our ignorance of things that causes all our admiration and chiefly excites our passions.

And questions give us no rest. We know not why our curse makes us seek we know not what, ever and ever. But we cannot resist it. It whispers to us that there are great things on this earth of ours, and that we can know them if we try, and that we must know them. We ask, why must we know, but it has no answer to give us. We must know that we may know.

We knew that, though.
We suspected it.
Do we know it now?
We suspect it harder," Elvi said. "We're scientists. We only know things until someone shows us we're wrong.

that in order to progress we must recognize our ignorance and leave room for doubt.