Mr. Sharif's visit to Iran seems important only from Pakistan's standpoint and not from Iran's point of view.  I think Iran will be wasting time by carrying on with these summit meetings because of basic differences in their foreign cultural and religious policy differences.  Due to the Saudi pressure, Pakistan has been supporting the rebels in Syria and in fact sending Pakistani fighters there to fight against Asad's regime which is not appreciated by Iran who is the backbone of Asad, minority Shias are being tortured and killed in Pakistan every day and being treated like a second class citizen which is against the interest of Iran being a Shia dominated country,  Pakistan has been contemplating and now under a contractual agreement to build a gas pipeline from Iran to India via Pakistan is wavering on this issue due to the pressure from the Saudi government.  In addition to all these differences, one should not under estimate the military issue at the Iranian-Pakistani border as far as the treatment of Iranian soldiers are concerned.  Iran should also never forget that it is the Saudi government's financial support which is keeping Pakistan alive and, under no circumstances, Pakistan would like to cut this umbilical cord which is helping it to feed and breathe.  Also, it is a common knowledge now that Saudis are asking Pakistan that it is a pay off time and Saudi's would like to get the nuclear stuff from Pakistan in return to counter Iran's nuclear threat.  Now the question in front of Iranian government is that if it is really a good time to continue these discussions and hoping against hope that Pakistan will mend its foreign, domestic and cultural polices to appease Iran and offend its feeding arm - Saudis.