Certainty

> //We know accurately only when we know little; with knowledge doubt increases. //(Johann Wolfgang von Goethe) >> //The best lack all conviction, while the worst // >> //Are full of passionate intensity. //
 * What may be meant by Martin Luther King’s claim that “Nothing is more dangerous than sincere ignorance and conscientious stupidity”, or the following lines by W B Yeats?
 * To what extent is certainty attainable within each of the ways of knowing or within each of the areas of knowledge?
 * In the absence of evidence, is certainty possible? Can there be certainty about a claim that is false?