Kohelet Rabbah, the rabbinic commentary on Ecclesiastes, grapples with this very feeling. It opens with the powerful image of rivers flowing into the sea: "All the rivers go to the sea, yet the sea is not full." What does this mean for us, for our pursuit of wisdom?

One interpretation offered is that "all the wisdom of a person is only in his heart," yet "the heart is never full." Our minds, our hearts, are vast and ever-expanding. But what if we lose what we've learned? What if knowledge slips through our fingers? The text reassures us: "They go there again." It suggests a cycle, a return. Wisdom isn't a finite resource that depletes with use. Instead, it's a current that flows back to its source, ready to be drawn upon again.

This idea echoes in another interpretation: "All the Torah that a person studies is only in the heart, yet the sea is not full.” Again, the emphasis is on the boundless nature of learning. And just as the heart is never full, "the soul is never sated," as Ecclesiastes 6:7 reminds us: "But the soul is not filled."

But what about sharing that knowledge? Does expressing our learning diminish it? Again, the text offers reassurance: "They go there again." This time, it's linked to Deuteronomy 6:6: "These matters that I am commanding you today shall be upon your heart." The implication is clear: Torah study and its internalization are not diminished by sharing; they’re reinforced, deepened.

The text then shares a fascinating anecdote involving a noblewoman and Rabbi Yosei bar Ḥalafta. The noblewoman poses a challenging question about Daniel 2:21: "He granted wisdom to the wise [and knowledge to those with understanding]." Shouldn't it be the other way around, she asks? Shouldn't wisdom be granted to the unwise?

Rabbi Yosei responds with a parable. Imagine two people asking to borrow money: one rich, one poor. To whom would you lend? The noblewoman, naturally, says she'd lend to the wealthy one. Why? Because if the wealthy person loses the money, they can repay it.

Rabbi Yosei then delivers the punchline: "Don’t your ears hear what you utter with your mouth?" If God granted wisdom to the foolish, they would misuse it, "pontificating in its regard in bathrooms, theaters, and bathhouses," places of impurity and irreverence. Instead, God grants wisdom to the wise, who then use it in sacred spaces like synagogues and study halls, the batei midrash. The lesson? Wisdom isn't just about accumulating knowledge; it's about cultivating the proper vessel, the right environment, for that knowledge to flourish. It's a beautiful illustration of the importance of kavanah, intent, in our learning and our lives.

So, the next time you feel overwhelmed by the vastness of knowledge, remember the rivers and the sea. Remember that learning is a cyclical process, a journey of constant return. And remember that wisdom isn't just about acquisition, but about cultivating the heart and mind to receive it, to use it, and to share it in a way that honors its source.