The sages say that תלמוד גדול שהתלמוד מביא לידי מעשה (Kiddushin 40b) this can be understood in the technical way, which makes perfect sense, you cannot fulfil the mitzvoth if you don't know what to do, and you never end, there's always more to it.
But I understand that statment also in the 'emotional' way. let me explain.
Once a person asked the Chazon Ish if he should leave his 'seder iyun' to replace it with a rapid learning of halacha or the Daf Yomi, the Chazon Ish answered "if you do so, when will you learn mussar?". (this is found in one of his responsas, I don't remember which one . But you should see his book אמונה וביטחון , part 3; where he expands on this concept)
When you learn torah specially when its in-depht , you identify with it, and that creates passion, consisting in hate of worldly desires, and love for the law, for the mitzvah, for the word of God, and love for God himself*, and that makes you have a very different perspective when doing the mitzvoth.
So תלמוד גדול שהתלמוד מביא לידי מעשה refers also to the Quality of your thoughts and intentions when doing the mitzvah, therefore improving the effect the mitzvah has in you; therefore arising the need in you to learn more, and you get to an endless loop of closeness to God.
*it's not a coincidence that in Kriyat Shma, the mitzvah of learning torah comes right after אהבת ה׳.