Started by Euan

Please could everybody tell me what they think he meant by this statement? In what context was he using it? It was also paraphrased by FDR "that we have nothing to fear but fear itself - nameless, unreasoning, unjustified terror". My personal take on this has been that they both were referring to the very basic human psychology of fear of the unknown. But I might be wrong to think that way. I have looked on this internet for the answer and have found none. Maybe someone knows more about this.