An excerpt from an article I read today:
It is easy to think you have a heart for orphans on the other side of the world, but if you spend your time at home resenting the imposition your children are on you, you do not. You cannot have a heart for the gospel and a fussiness about your life at the same time. You will never make any difference if you cannot be at peace . You cannot have a heart for missions, but not for the people around you. A true love of the gospel overflows and overpowers. It will be in everything you do, however drab, however simple, however repetitive. ~Motherhood as a Mission Field by Rachel Jankovic
Here's the whole thing. Every mother should read it.