Love.
The reason I wanted children (which I always have) is love. They give pure, unconditional love, and so do you in return.
Yes, they cost money, but so what? I can think of nothing more worthy to spend my money on.
They bring me joy, they make me smile, and I'm one of those people who feels I was "made to be a mother".
If you will, having children has always been my "special interest".
I LIKE doing things for them. I LIKE explaining how the world works. I LIKE sharing my knowledge and affection with them.
Do they appreciate me? Not unless I tell them to. It's not their job to big up my ego or comfort me or make me happy. They're just kids. They'll be kids and they're perfect as they are.
Why do I want kids? Because, in addition to all the rest, when I die I KNOW I will have done something good. I will have loved two people who will then go on to love others.
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Be not angry that you cannot make others as you wish them to be, since you cannot make yourself as you wish to be.
~Thomas à Kempis
"Be plain, good son, and homely in thy drift;
Riddling confession finds but riddling shrift"
~Shakespeare