Using uncertainty

Knowledge is certain in terms of its eventuality. Complete knowledge is unachievable. The level of knowledge must be determined that is appropriate to specific actions. For example, relief operations need not be delayed until a count of casualties is made; and justice need not require all the evidence, only a sufficiency. There are also signs which may not be certain but are indicative: for example, when dark clouds gather rain is expected; or when a country militarizes aggression may be anticipated. Thus action may be based on uncertain but probable knowledge; reasonable certainty.