Taken from Karen Armstrong's The Bible: A Biography:
There could be no definitive interpretation of scripture. this point was made in the very early days at Yavneh, when R. Eliezer was engaged in an intractable argument with his colleagues about a legal ruling (halakha) in the Torah. When they refused to accept his opinion, R. Eliezer asked God to back him up with some miracles, and--mirabile dictu--a carob tree moved four hundred cubits of its own accord; water in a conduit flowed uphill; and the walls of the house of studies shook so violently that the building seemed about to collapse. But the other rabbis were not impressed by this show of supernatural force. In desperation, R. Eliezer asked for a bat qol ('voice from heaven') to adjudicate and the divine voice obligingly declared: 'What have you against R. Elizer? The Halakah is always as he says.' But Rabbi Joshua quoted a verse from Deuteronomy: 'It is not in heaven.' The Torah was no longer confined to the celestial world; once it had been promulgated on Mount Sinai, it no longer belonged to God but was the inalienable possession of very single Jew. So, commented a later rabbi, "We pay no attention to a heavenly voice.' And furthermore, it had been decreed at Sinai: 'By a majority you are to decide', so R. Eliezer, a minority of one, could not override the popular vote. When God heard that his opinion had been overruled, he laughed and said: 'My children have conquered me.'