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 space.  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]. ~ Chovos Halevovos