"Too many people grow up. That's the real trouble with the world, too many people grow up. They forget. They don't remember what it's like to be 12 years old. They patronize, they treat children as inferiors."
- Walt Disney

Adults are supposed to be emotionally stronger than children because they have experienced more struggles and pain....
"The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt."
- Max Lerner

Whatever will be will be, but a person has some control over his/her life....

From the song 'Que Sera, Sera" by Doris Day:

When I was just a little girl,
I asked my mother what will I be,
Will I be pretty, will I be rich,
Here is what she said to me:
Que sera, sera,
The future is not ours to see,
What will be will be.

https://www.youtube.com/watch?v=SdhAfMor9BM

"You grow up the day you have your first real laugh at yourself."
- Ethel Barrymore

"Most people don’t grow up. Most people age. They find parking spaces, honor their credit cards, get married, have children, and call that maturity. What that is, is aging. But to grow up, to take responsibility for the time you take up, and the space you occupy, to honor every living person for his or her humanity, that is to grow up."
- Maya Angelou