FRANKFURT (Reuters) - Greece leaving the euro zone would damage the credibility of the currency block but so too would Greece staying while it continuously violated its financial obligations, French Finance Minister Michel Sapin said on Thursday. "You can’t say stay in the Eurosystem just because you love it," Sapin told a conference in Frankfurt. "We can’t have solidarity if you do not accept responsibility." (Reporting by Balazs Koranyi and John O'Donnell; Editing by Francesco Canepa)