Why: if, filled with egotism, you think, I will not fight, this resolve of yours is vain, nature will compel you, again reinforcing the earlier point that some version of engaged action is inevitable regardless of preference, resistance to that reality is simply futile.

In life: refusing to engage with a responsibility you actually can't escape, rather than accepting and working with it, tends to be a genuinely futile stance, the responsibility remains regardless of your resistance to it.

Teaching: for a responsibility you've been resisting rather than accepting, consider whether that resistance is actually accomplishing anything beyond your own added suffering, if the responsibility isn't actually going away regardless, working with it directly tends to be the more useful stance.