Answer:
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
Take away my first letter take away my second letter take away all my letters and I would remain the same.
Used left or right I get to travel over cobblestone or gravel. Used up I vie for sweet success used down I cause men great duress.
I am born in fear raised in truth and I come to my own in deed. When comes a time that I'm called forth I come to serve the cause of need.
I make things short but I am pretty long myself
I flow from the Homerβs mouth when he sees doughnuts.