Federal Reserve Chairman Jerome Powell said in a speech before Princeton University graduation on Sunday that becoming an honest public service provider is always a worthwhile choice, Internet reported. At this time, he had been subjected to ruthless personal attacks from US President Trump for several months. Powell said: "As you move forward in a world full of bright opportunities, I urge you to rise to the challenges and seize the opportunity to serve your fellow citizens. Fifty years from now, you will want to be able to look in the mirror and know that you have done what you think is right at every stage of your life." He said: "In the final analysis, integrity is everything you have. Please protect it carefully."