For This You Were Created
However much Torah a person learns, he should not take credit for it, because learning is the very purpose of his creation.
Rabban Yochanan ben Zakkai used to say: If you have learned much Torah, do not hold it as a credit to yourself, for this is what you were created for. These words come from the man who mastered more Torah than almost anyone in his generation. He does not belittle learning; he raises it so high that it can no longer be a reason for pride. No one takes credit for simply being what he was made to be, and a Jew was made to learn Torah. Learning becomes an honor instead of a favor we do for Hashem. And because there is always more to learn, a person who sees Torah as his purpose never feels that he has finished.
Source: Pirkei Avos 2:8; see also Avos d'Rebbi Nosson 14
The next time you finish something in learning, a perek, a sugya or a week of shiurim, notice any feeling of I did a lot. Instead, say a short thank-you to Hashem in your own words for giving you the time and the mind to learn. Then set your next small goal right away. Treating learning as your purpose, not your achievement, keeps it growing.