The Programming Language Is Your Most Powerful Tool
Ola is so spot on with this one:
A New Hope: Polyglotism: “The one thing that I am totally sure if is that we need better tools. And the most important tool in my book is the language. It’s interesting, many Java programmers talk so much about tools, but they never seem to think about their language as a tool. For me, the language is what shapes my thinking, and thus it’s definitely much more important than which editor I’m using.”
I do not know how many discussions I have had with Java developers who questions Ruby et al. because there are no IDE’s with the same feature sets as those found in Java.