Answer:
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 there when you sit, but gone when you stand. What am I?
I am a mountain at night, meadow at day. What am I?
I come in different colors and shapes. Some parts of me are curvy some are straight. You can put me anywhere you like but there is only one right place for me.
Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot. All is cool where it is not. What is it?
No matter how little or how much you use me, you change me every month.