At five years of age the study of Scripture; At ten the study of Mishnah; At thirteen subject to the commandments; At fifteen the study of Talmud; At eighteen the bridal canopy; At twenty for pursuit [of livelihood]; At thirty the peak of strength; At forty wisdom; At fifty able to give counsel; At sixty old age; At seventy fullness of years; At eighty the age of “strength”; At ninety a bent body; At one hundred, as good as dead and gone completely out of the world.
Ben Zoma says: Who is the wise one? He who learns from all [people], as it says, "I have acquired understanding from all my teachers" (Psalms 119:99).
אמר רבה בר בר חנה למה נמשלו דברי תורה כאש שנאמר (ירמיהו כג, כט) הלא כה דברי כאש נאם ה' לומר לך מה אש אינו דולק יחידי אף דברי תורה אין מתקיימין ביחידי
והיינו דאמר רבי יוסי בר חנינא מאי דכתיב (ירמיהו נ, לו) חרב אל הבדים ונואלו חרב על שונאיהן של תלמידי חכמים שעוסקין בד בבד בתורה ולא עוד אלא שמטפשין שנאמר ונואלו
Rabba bar bar Ḥana said: Why are matters of Torah compared to fire, as it is stated: “Is not My word like fire, says the Lord” (Jeremiah 23:29)? To tell you: Just as fire does not ignite in a lone stick of wood but in a pile of kindling, so too, matters of Torah are not retained and understood properly by a lone scholar who studies by himself, but by a group of Sages.
Those who study by themselves grow foolish from their solitary Torah study, as it is stated: “And they shall become fools.”
...It is stated: “In the morning sow your seed, and in the evening do not withhold your hand; for you do not know which shall prosper, whether this or that, or whether they both alike shall be good” (Ecclesiastes 11:6).
Rabbi Akiva says that the verse should be understood as follows: If one studied Torah in his youth he should study more Torah in his old age; if he had students in his youth he should have additional students in his old age, as it is stated: “In the morning sow your seed, etc.”
They said by way of example that Rabbi Akiva had twelve thousand pairs of students, and they all died in one period of time, because they did not treat each other with respect. And the world was desolate of Torah until Rabbi Akiva came to our Rabbis in the South and taught his Torah to them. And these are the very ones who upheld the study of Torah at that time. Although Rabbi Akiva’s earlier students did not survive, his later disciples were able to transmit the Torah to future generations.
והוי מתאבק בעפר רגליהם כיצד בזמן שת״ח נכנס לעיר אל תאמר איני צריך לו אלא לך אצלו ואל תשב עמו לא על גבי המטה ולא על הכסא ולא על הספסל אלא שב לפניו על הארץ וכל דבר שיצא מפיו קבלהו עליך באימה ביראה ברתת ובזיע כדרך שקבלו אבותינו מהר סיני באימה ביראה ברתת ובזיע. דבר אחר הוי מתאבק בעפר רגליהם זה רבי אליעזר ושותה בצמא את דבריהם זה רבי עקיבא. מה היה תחלתו של רבי עקיבא. אמרו בן ארבעים שנה היה ולא שנה כלום.
What was the beginning of R. ‘Aḳiba? It was said of him that at the age of forty he had learnt nothing at all. On one occasion, as he was standing by the mouth of a well, he enquired, ‘Who carved out this stone?’ They answered, ‘The water which constantly falls on it, day in and day out’. Forthwith R. ‘Aḳiba applied to himself the following argument: If the soft [water] can wear away the hard [stone], how much more can the words of the Torah, which are hard like iron, carve a way into my heart which is of flesh and blood! Immediately he turned to the study of the Torah.