"There is nothing impossible to God." St Rita

All things are possible for God. All that can be done is possible to God. But just because it can be done, God may not will it to be done. Jesus addressed this. A man can to Jesus asking "if you can" asking for the healing of his son. Another person came and said, "if you will." Can Jesus heal? Yes. Will he heal the way we desire him to? Not necessary. It is not for us to determine. We are not God. Our petitions should be made with faith expectancy that the will of God may be manifested, not our will. Recall the words of Jesus in the Garden, "Father, take away this cup, yet not my will but yours be done." What God willed was, not the death of his Son, but the salvation of the world though his obedience.