Thought by:
 Martin Fowler

In a professional environment, the ratio of time spent reading versus writing code is about 10 to 1. Producing clean, comprehensive and maintainable code is of utmost importance and leads to increased team effectiveness. Here's nice quote from Thought Works Martin Fowler which sums it up quite nicely.

Any fool can write code that a computer can understand. Good programmers write code that humans can understand.
Any fool can write code that a computer can understand. Good programmers write code that humans can understand.