I like these:

One of my most productive days was throwing away 1000 lines of code.

-- Ken Thompson

The computing scientist's main challenge is not to get confused by the complexities of his own making.

-- E. W. Dijkstra

Simplicity is prerequisite for reliability.

-- Edsger W. Dijkstra

Measuring programming progress by lines of code is like measuring aircraft building progress by weight.

-- Bill Gates

First, solve the problem. Then, write the code.

-- John Johnson