This is the meaning of the passage Emes Veyatziv (the blessing after Shema): We describe at length how we affirm and establish “this matter” of committing to Torah study “upon us and our ancestors and our descendants etc. from the first generations until the last generations (i.e., until forever),”
We draw down from Above the ability to experience that the Torah is “true, certain, established, etc. pleasant and sweet etc.,” we do so in order to draw down Hashem’s Infinite Light to dwell and be revealed in the “light” (i.e., experience) of our Torah study.
A person can study Torah as a mere intellectual pursuit, without experiencing the Divine aspect in it, how it connects him with Hashem.
In order to experience Hashem’s Light in the Torah study, we first need to awaken a love and fear of Hashem in prayer. In addition, by reciting the passage of Emes Veyatziv we bring down and connect our connection to Hashem in prayer with our subsequent Torah study. This enables us to experience how the Torah is “true and certain... pleasant and sweet...” with all the 15 descriptions mentioned in the passage.
