Here's the new thread for posting quotes, with the usual rules:
Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
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That's terrible advice. Far better to spend that time thinking of a better attack plan. Make sure it includes contingencies to deal with anyone who may wish to avenge whoever you are killing.
My understanding is that the advice is to be aware that you could also end up dead, so you should dig an extra grave for yourself. It's not practical advice, it's a warning that revenge is dangerous and not worth it.
3MixedNuts
I think the point of the quote is that it's yet better to spend that time doing productive things unrelated to revenge, given that generating enough such contingencies is pretty costly.
Edit: Actually, wedrifid is right.
Here's the new thread for posting quotes, with the usual rules: