Abstract

In 1952, having for the first time to give a lecture in Madrid, I said somewhat dejectedly to the able and witty young man entrusted with the tedious task of revising the Spanish of my text that I found my lecture didn't amount to much: it was but a long paraphrase of one single idea. Perhaps I hoped for an enthusiastic protest on his part. But he only offered as solace the terse remark: ‘Well, I have heard many a lecture that didn't contain even one single idea’