“Everybody gets told to write about what they know. The trouble with many of us is that at the earlier stages of life we think we know everything- or to put it more usefully, we are often unaware of the scope and structure of our ignorance.”

“The corollary of constant change is ignorance. This is not often talked about: we computer experts barely know what we're doing. We're good at fussing and figuring out. We function well in a sea of unknowns. Our experience has only prepared us to deal with confusion. A programmer who denies this is probably lying, or else is densely unaware of himself.”

“What gets us into trouble is not what we don't know. It's what we know for sure that just ain't so.”

“It's not always what we don't know that gets in our way; sometimes it's what we think we know that keeps us from learning.”

“Just when we think we have a system, ...the system collapses. Just when we know our way around, we get lost. Just when we think we know what's coming next, everything changes.”

“According to Plato, we don't learn anything. Our soul has lived so many lives that we know everything. Teachers and education can only remind us of what we already know.”