I think it's more "think about what you wish to accomplish with the piece of code that you're about to write". Are you trying to write something that will satisfy users' desires? Then you darn well better think about every aspect of those desires, and make sure that the code you write satisfies them. Or are you trying to learn what users' desires are, or how the technology you have available will help you satisfy them? In that case, you may be better off just diving in and coding, but you should think about the question you want answered before you code.
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I think it's more "think about what you wish to accomplish with the piece of code that you're about to write". Are you trying to write something that will satisfy users' desires? Then you darn well better think about every aspect of those desires, and make sure that the code you write satisfies them. Or are you trying to learn what users' desires are, or how the technology you have available will help you satisfy them? In that case, you may be better off just diving in and coding, but you should think about the question you want answered before you code.