Smile, what's the use in crying?

I was singing a sweet old song to my daughter as I was trying to rock her to sleep. I'm not sure why I always try to sing to her, because instead of putting her to sleep it usually makes her laugh....hard. In fact, like everybody else who has ever had the misfortune of listening to me sing, I think Eva would prefer it if I just kept my mouth shut.
Honestly, the only person who truly enjoys my singing is my son Mason...and he might be deaf. That boy would love it if I laid in bed next to him singing all night long while he snuggled next to me with his little arm wrapped around my neck. Ahh, how I love that little monster.
Back, to Eva. I was looking down at her chubby little face singing "Smile, though your heart is aching. Smile, even though it's breaking..." Of course at this point she is smiling...and laughing. And, I'm pretty sure it wasn't her heart that was aching...lol! That's when I began to think about what I was saying. Do I want her to fake a smile? Most parents would instantly say "No! I want my child to be "real" and "honest". But, why does sitting down and crying or moping around have to be the "real" way?
I have never been a huge cryer. I can remember the last time I had a good cry. It was more than six months ago. Now, I did read somewhere that crying is actually healthy for you and releases some sort of toxin through your tears, so occasionally when I'm really hurting I do try and squeeze out a few tears just so I don't die or something, but other than that I just don't cry. Quite frankly I feel a little selfish and stupid for crying when I have so much to be thankful for and when I think of other people who have it way worse than I do.
I kinda want to teach my daughter to keep her chin up. Things are gonna happen. That's life. Will there be times when she absolutely can not control the tears? Of course, and I will be there to help her dry them. Life is life and I won't be able to stop her from ever getting hurt. Inevitably there will be someone at some point who does her wrong, who breaks a promise and maybe her heart. Whether its a friend, a teacher, a boyfriend or even a family member. There will be tough situations and hard decisions to make, but if I can teach her to keep moving forward with that beautiful smile on her face then I will have done my job.