An analogy: Two men meet, and they do not separate from each other until one has walked a mil, and the other, a mil, at which time they are found to be at a distance of two mills from each other. Variantly: Lest you say: There are the sons of the elders, there are the sons of the great ones, there are the sons of the prophets (i.e., Let them study the Torah!) It is, therefore, written "For if keep, you (plural [i.e., all of you]) shall keep all of this mitzvah."
We are hereby taught that all are equal in (the mitzvah of studying) Torah. And thus is it written (Devarim 33:4) "Torah was commanded to us by Moses, the inheritance of the congregation of Jacob": It is not written "Cohanim, Levites, and Israelites," but "the congregation of Jacob." And thus is it written (Ibid. 29:9) "You are standing this day, all of you, before the L-rd your G-d, your heads of your tribes, your elders and your officers, all the men of Israel."
If not for (all of) these, who stood and fulfilled Torah in Israel, would Torah not have been forgotten in Israel? And if Shafan in his time (viz. II Kings 22) and Ezra in his time and R. Akiva in his time had not stood up (on behalf of Torah), would Torah not have been forgotten in Israel? And it is written (Proverbs 15:3) "A thing in its time — how good!" The thing that this one (i.e., each one of those in his time) said is over and against all!
It is written (Amos 8:12) "They will wander to seek the word of the L-rd and they will not find it": As a tourist, who goes from city to city and from province to province, so is a woman destined to make the rounds of the houses of prayer and the houses of study about a sheretz (a creeping thing) that had touched a loaf to determine whether (this is an instance of) first-degree or second-degree tumah (uncleanliness).
R. Shimon b. Yochai says: G-d forbid (to say) that Torah will be forgotten from Israel. Is it not written (Devarim 31:21) "for it will not be forgotten from the mouth of their seed"? How, then, am I to understand "They will wander to seek the word of the L-rd and they will not find it"? They will not find a clear halachah in one place, but one man will forbid, and another permit; one man will rule unclean, and another, clean, and they will not find a clear thing.