Chesterton Quote - A Woman's Function

How can it be a large career to tell other people’s children about [arithmetic] , and a small career to tell one’s own children about the universe? 
How can it be broad to be the same thing to everyone, and narrow to be everything to someone?
No, a woman’s function is laborious because it is gigantic, not because it is minute.  
~ G. K. Chesterton