She is carrying home that stick to build for other ants' children.

So do the white ants in the tropics.
They have learnt not to compete, but to help each other; not to be selfish, but to sacrifice themselves; and therefore they are strong.
But you told me once that ants would fight and plunder each other's nests.

And once we saw two hives of bees fighting in the air, and falling dead by dozens.
My child, do not men fight, and kill each other by thousands with sharp shot and cold steel, because, though they have learnt the virtue of patriotism, they have not yet learnt that of humanity?
We must not blame the bees and ants if they are no wiser than men.

At least they are wise enough to stand up for their country, that is, their hive, and work for it, and die for it, if need be; and that makes them strong.
But how does that make them strong?
How, is a deep question, and one I can hardly answer yet.

But that it has made them so there is no doubt.