It means that if you take a situation as only with a grain of salt, that it wont' preside over anything else, (either than at that time or ever), it is like if you only added a grain of salt to it the substance or staying power is very short.
You can not get far with it.
It has no sense of adhesion or lasting measure of time.
The content is not something that has precedence.
at 8:51 AM on Nov. 9, 2010