Patience inside the unknown

The little cries over the achievements she thinks she's lost her grandfather looks over to her and whispers " it's going to be okay" the little girl sits up and asks him " how do you that?" He replied to her " I know the world works in ways we don't understand" she then asks him " am I going to be okay too?" He said to " you'll always be okay, I just you to be happy' the little girl gave her grandfather's words some thought then asked him a final question 'how will I know if I'm happy?" Her grandfather turned to her and said " when you can't stop smiling."