"A computer lets you make more mistakes faster than any invention in human history—with the possible exceptions of handguns and tequila."

and another one from the snowy wastes of that there internet:

"Walking on water and developing software from a specification are easy if both are frozen."

If (then else)

If you can keep your code clean while others are corrupting it,

And losing their data and blaming it on you,

If you can be sure that DVCS is right when all coders doubt you,

But make allowance for SVN being pretty nifty too,

If you can wait for compiles and not be tempted to turn off warnings,

Or, seeing a broken window, fix it,

Or, getting a harsh peer review, don't give way to stubborness,

And yet don't appear to be a guru, nor talk like one

Then you'll be a developer, my son.

(From Programmers Stack Exchange, Apologies to Kipling)