Writing is hard work. A clear sentence is no accident. Very few sentences come out right the first time, or even the third time. Remember this as a consolation in moments of despair. If you find that writing is hard, it's because it is hard. It's one of the hardest things that people do.

William Zinsser. On Writing Well

Comprehensive documentation does not ensure project success, in fact, it increases your chance of failure.

Scott Ambler. Best Practices for Agile/Lean Documentation

Automation also reduces the need for documentation.

Mike Clark. Pragmatic Project Automation: How to Build, Deploy, and Monitor Java Applications

Design is an inherently messy process, and along the way many descriptions are discarded after serving their purpose.

Outside your extreme programming project, you will probably need documentation: by all means, write it. Inside your project, there is so much verbal communication that you may need very little else. Trust yourselves to know the difference.

Ron Jeffries. Essential XP: Documentation

It’s probably fair to say that poor documentation kills more libraries and tools than any other issue.

Joe Ottinger. Hand pick the right software project for your situation

But making written documents that actually help the team produce good software is a challenge.

Eric Evans. Domain-Driven Design