I sincerely hope that the two posts above are not correct; that there are no new ideas to be had. One is reminded that there once was a proposal in Congress over 100 years ago that there was no need for a patent office as all useful inventions had already been invented. Certainly new philosophy contradicts the old, as did those old philosophies contradict those which went before them. One only need remember that the Church and others roundly defended Aristotle's claims of a geocentric universe, to the point of placing Galileo under house arrest. To say that all the great ideas have already been determined is not too far from that approach. The new Plato, the new Aristotle, are out there--possibly today. We simply have not discovered them yet, if they have indeed been born.
I well remember hearing the Astronaut Charles Duke, who walked on the moon, deliver a commencement address in which he relied on Dr. Suess' book, On Beyond Zebra. He remarked then that today's children would see a further horizon than we, due to the mountains that we had climbed. May the day never come that we say there are no new ideas, or that we have learned "enough." To do so is to close the door on our future, and revert to the days of scholasticism where those who dared to think outside the box were imprisoned and tortured for simply thinking.
"No place for the discovery of ideas?" May God forbid the day.