A person who does not understand the affairs of the world thinks that it is the newly created cause that affects change in things and their transformation from one set to another.  Actually, the cause is too weak and insignificant to bring about change or transformation in the essence of things.  We perceive for instance, that a single grain of wheat produces three hundred ears of wheat, each of which bears thirty grains, so that a single grain produces ten thousand grains or nearly that number.  Can anyone fail to recognize that the force inherent in the grain is insufficient to produce this amount?  And so it is with other grains that are sown or planted.  The same applies to the generation of a human being and of other living creatures from a drop of semen or the growth of a large fish from a tiny fish egg. pg 377

 It should be clear to a person that all created things in this world, whether substance or accident, have definite limits.  Nothing can add to or detract from what the Creator may He be exalted decreed in regard to its quantity, quality, time, or place.  No one can increase what He decreed to be few or diminish what He decreed to be many. No one can postpone what He decreed to move forward or advance what He decreed to delay, And whatever runs contrary to this was so decreed in foreknowledge from the very first it is just that all such decrees have natural causes and these causes have causes which preceded them. 

 When a person realizes that no one of the created things can help him or harm him except with the permission of the Creator, may He be exalted he will turn his heart away from fear of them or hope in them and will trust in the Creator alone.  One should be conscious of GD's abundant goodness to man and how in His great kindness and grace, He raised him on this good without his deserving it and not out of any need to do so but rather as a gift, a favor and a grace.