Any tool should be useful in the expected way, but a truly great tool lends itself to uses you never expected.

With enough eyes, all bugs are shallow.

Equally, the Internet interprets attempts at proprietary control as threats and mobilizes to defeat them.

Complexity control is the central problem of writing software in the real world

The iPhone brand is in worse shape than I thought was even possible. And the implications of that are huge... The iPhone is in deep trouble.

Every good work of software starts by scratching a developers personal itch.

Ugly programs are like ugly suspension bridges: they're much more liable to collapse than pretty ones, because the way humans (especially engineer-humans) perceive beauty is intimately related to our ability to process and understand complexity. A language that makes it hard to write elegant code makes it hard to write good code.