Jamieson, Fausset and Brown on Esther 4:13-14

13-14. Then Mordecai commanded to answer Esther--His answer was to this effect, that Esther need not indulge the vain hope she would, from her royal connection, escape the general doom of her race--that he (Mordecai) confidently believed God would interpose, and, if not through her, by some other deliverer, save His people; but that the duty evidently devolved on her, as there was great reason to believe that this was the design of Providence in her elevation to the dignity of queen, and therefore that she should go with a courageous heart, not doubting of success.