Judaism 101
When Will the Mashiach Come?
There are a wide variety of opinions on the subject of when the mashiach will come. Some of Judaism's greatest minds have cursed those who try to predict the time of the mashiach's coming, because errors in such predictions could cause people to lose faith in the messianic idea or in Judaism itself. This actually happened in the 17th century, when Shabbatai Tzvi claimed to be the mashiach. When Tzvi converted to Islam under threat of death, many Jews converted with him. Nevertheless, this prohibition has not stopped anyone from speculating about the time when the mashiach will come.
Although some scholars believed that G-d has set aside a specific date for the coming of the mashiach, most authority suggests that the conduct of mankind will determine the time of the mashiach's coming. In general, it is believed that the mashiach will come in a time when he is most needed (because the world is so sinful), or in a time when he is most deserved (because the world is so good). For example, each of the following has been suggested as the time when the mashiach will come:
if Israel repented a single day;
if Israel observed a single Shabbat properly;
if Israel observed two Shabbats in a row properly;
in a generation that is totally innocent or totally guilty;
in a generation that loses hope;
in a generation where children are totally disrespectful towards their parents and elders;
Judaism 101: Mashiach: The Messiah < click