Some explain the prayer, “grant us our portion in the Torah,” as a request not only to be granted a portion in Torah but also to be granted the knowledge of which portion is ours.
Every Jew can and must study Torah, but if he concerns himself with aspects of Torah that are not truly his, then although he has certainly fulfilled the commandment to study Torah, he fails to realize the ultimate potential of his soul in regard to Torah study.
—Rabbi Adin Steinsaltz