As part of a con­tin­u­ing series*, O’Reilly requested “pearls of wis­dom for pro­gram­mers” from lead­ing prac­ti­tion­ers of the craft, pub­lish­ing the responses. The end result is the O’Reilly Com­mons wiki, 97 Things Every Pro­gram­mer Should Know.

The con­tri­bu­tions that appear in the final, pub­lished book are freely avail­able as are sixty-eight fur­ther con­tri­bu­tions that didn’t make it.

This from Don’t Just Learn the Lan­guage, Under­stand its Cul­ture:

Real­iz­ing how inter­wo­ven for­eign words and phrases gave [James Joyce] new ways of express­ing him­self is some­thing I’ve kept with me in my pro­gram­ming career.

In their sem­i­nal book, The Prag­matic Pro­gram­mer, Andy Hunt and Dave Thomas encour­age us to learn a new pro­gram­ming lan­guage every year. I’ve tried to live by their advice and through­out the years I’ve had the expe­ri­ence of pro­gram­ming in many lan­guages. My most impor­tant les­son from my poly­glot adven­tures is that it takes more than just learn­ing the syn­tax to learn a lan­guage: You need to under­stand its culture. 
[…]

Once you’ve learned the ropes of a new lan­guage, you’ll be sur­prised how you’ll start using lan­guages you already know in new ways.

Some might argue that Finnegans Wake is unread­able, while oth­ers applaud it for its styl­is­tic beauty. To make the book a less daunt­ing read, sin­gle lan­guage trans­la­tions are avail­able. Iron­i­cally, the first of these was in French. 
Code is in many ways sim­i­lar. If you write Wakese code with a lit­tle Python, some Java, and a hint of Erlang, your projects will be a mess. If you instead explore new lan­guages to expand your mind and get fresh ideas on how you can solve things in dif­fer­ent ways, you will find that the code you write in your trusty old lan­guage gets more beau­ti­ful for every new lan­guage you’ve learned.

I guess another could be Don’t Rush?

*Other books in the series (full-content wikis): 97 Things Every Soft­ware Archi­tect Should Know and 97 Things Every Project Man­ager Should Know.