One of my favourite parts from Sandi Metz's book Practical Object-Oriented Design in Ruby. Getting it to work is the boring part.
Anyone can arrange code to make it work right now. Today's application can be beat into submission by sheer force of will. It's a standing target at a known range. It is at your mercy.
Creating an easy-to-change application, however, is a different matter. Your applicaiton needs to work right now just once; it must be easy to change forever. This quality of easy changeability reveals the craft of programming. Achieving it takes knowledge, skill, and a bit of artistic creativity.
Sandi Metz, Practical Object-Oriented Design in Ruby