This is no time to engage in the luxury of cooling off or to take the tranquilizing drug of gradualism. - Martin Luther King Jr.

The original German is "Vernunft … ist die höchste Hur, die der Teufel hat".

Then, finally, it can become so morbid that it rises to ominous proportions and leads to a tragic sense of persecution. There are persons who come to the point that they are so self-centered that they end up with a persecution complex and the end result is insanity. They end up thinking that the universe stands against them, that everybody is against them. They are turning around within themselves. They are little solar systems within themselves and they can't see beyond that. And as a result of their failure to get out of self, they end up with a persecution complex and sometimes madness and insanity. These are some of the effects of self-centeredness.

There is a sort of poverty of the spirit which stands in glaring contrast to our scientific and technological abundance. The richer we have become materially, the poorer we have become morally and spiritually. We have learned to fly the air like birds and swim the sea like fish, but we have not learned the simple art of living together as brothers.