Answer:
As destructive as life, As healing as death; An institutioner of strife, Just as prone to bless. It is all that is good, Yet with an evil trend; As it was the beginning of things, It can also be the end.
What is the thing that stays the same size, but the more it's used the more it decreases?
You heart it speak, for it has a hard tongue. But it cannot breathe, for it has not a lung.
Plow and hoe, reap and sow, What soon does every farmer grow?
Though I wander the earth, I am no longer here. I am pale and I chill everyone near. Who am I?
You use it between your head and your toes, the more it works the thinner it grows.