Answer:
I run smoother than any rhyme I love to fall but cannot climb.
When you need me, you must find me. When you find me, you no longer need me. What am I?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What am I?
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 am useless when together but useful when I am broken apart. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.