Formatting is no substitute for writing.

Thinking is not the ability to manipulate language; it’s the ability to manipulate concepts.

There is a race between the increasing complexity of the systems we build and our ability to develop intellectual tools for understanding their complexity. If the race is won by our tools, then systems will eventually become easier to use and more reliable. If not, they will continue to become harder to use and less reliable for all but a relatively small set of common tasks. Given how hard thinking is, if those intellectual tools are to succeed, they will have to substitute calculation for thought.

A distributed system is one in which the failure of a computer you didn't even know existed can render your own computer unusable.

Formatting is no substitute for writing.

"Sometimes" is sometimes "not never".

When I write a paper, I change my notation much more than I change my concepts.