[mikeash]

Do you breathe through a filter and sweep the ground in front of you like the Jains?

[dTal]

>as far as practically possible

There's a big difference in effort, and not much difference in outcome, between doing as the Jains do and simply endeavouring not to kill things on purpose.

[mikeash]

I don't see what's impractical about breathing through a filter and sweeping the ground. Inconvenient, to be sure, but that's far from the same thing.

I mean, I wouldn't do it, but it seems to me that if you're advocating "as far as practically possible" then it would include that.