Chancellor Angela Merkel said Germany remains open to resuming negotiations with Greece on financial assistance, though she won’t agree to a deal at any price.

“The door for talks with Greece was always open and always remains open,” Merkel said in a speech to lawmakers in the lower house of parliament in Berlin on Wednesday. “We owe that to the people and we owe it to Europe.”

At the same time, Merkel sent a message to Greek Prime Minister Alexis Tsipras that he has to meet conditions to win the release of further aid, saying it’s not about specific amounts of money but about principle.

“Yes, these are turbulent days and indeed a lot is at stake,” she said. “The world is looking at us. But the future of Europe is not at stake. The future of Europe would be at stake if we forgot who we are and what makes us strong: A union based on the rule of law and responsibility. If we were to forget that, the euro would fail and Europe with it.”

While Greece has the right to hold its planned referendum on July 5, the other 18 euro-area member states have the right to take positions that reflect their interests, Merkel said.

“Being a good European doesn’t mean seeking an agreement at any price,” she said.

No new negotiations can take place before the referendum, since Germany’s lower house, or Bundestag, must vote on opening any aid talks according to the rules of the European Stability Mechanism, Merkel said.