The Edge... There is no honest way to explain it because the only people who really know where it is are the ones who have gone over.

In the high country of the mind one has to become adjusted to the thinner air of uncertainty...

One is not bound to believe that all that is muddy is deep.

Only one mountain can know the core of another mountain.

there’s only a razor’s edge between self-confidence and hubris.

The known is finite, the unknown is infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to claim a little more land.

Be confident, not certain

What we know is a drop, what we don't know is an ocean.

Uncertainty is an uncomfortable position. But certainty is an absurd one.

I see a horseman disappearing into
the evening mist. Will he travel through woods
or across wild plains? Where is he heading? I don't know.
Tomorrow, will I be stretched out above or
below the earth? I don't know.

Thus the unfacts, did we possess them, are too imprecisely few to warrant our certitude...

What an abyss of uncertainty, whenever the mind feels overtaken by itself; when it, the seeker, is at the same time the dark region through which it must go seeking and where all its equipment will avail it nothing. Seek? More than that: create. It is face to face with something which does not yet exist, which it alone can make actual, which it alone can bring into the light of day.

Only then did he understand that he really wanted to know nothing about El Ga’a beyond the fact that it was isolated and unfrequented, that it was precisely those things he had been trying to ascertain about it.

Every judgment teeters on the brink of error,” Leto explained. “To claim absolute knowledge is to become monstrous. Knowledge is an unending adventure at the edge of uncertainty.