The Art of Progress

"The art of progress is to preserve order amid change and to preserve change amid order."

Source: 

Alfred North Whitehead
(British Mathematician and Philosopher, 1861-1947)

Reference: 

I first saw this quote in the book by Paul Heckel called "The Elements of Friendly Software Design." You can also find it here: http://thinkexist.com/quotation/the_art_of_progress_is_to_preserve_order_amid/222000.html