[Greek PM Tsipras addresses his lawmakers during a ruling Syriza party parliamentary group session in Athens](Reuters) - Greek Prime Minister Alexis Tsipras said in a speech in Berlin to a congress of European leftist parties on Saturday that it was time for his country's creditors to understand that the Greek people have made enough sacrifices. Tsipras also said that Greece would not surrender to those who want Greece to permanently maintain austerity policies. "Our creditors need to keep in mind that the Greek people have made enough sacrifices and now it's time for them to fulfil their obligations," he said.