A person is at times required to perform a mitzvah of action that no one else can perform–whether because it is his personal obligation, such as prayer or donning tefillin, or because no one else is available to do it.
Even if he is at present learning Torah, which corresponds to all the mitzvot, he is required to interrupt his studies.
Torah learning takes precedence only as long as others can perform a mitzvah–if not, the obligation of deed overrides that of Torah learning, no matter how high its level.
The purpose of Torah is in a sense the performance of the mitzvot.
As our sages state, the goal of wisdom is repentance and good deeds (Berachot 17a).
If a person learns Torah with no intent of putting his knowledge into practice, our sages teach, he would have been better off had he died in childbirth (Yerushalmi Berachot 1:2).
The purpose of creation and man's service is to a dwelling here below for God.
And so the lower the descent into a degraded, physical world, the greater will be the ascent of that world to its primal goal.
–Rabbi Adin Steinsaltz
From Understanding the Tanya, Ch. 37 by Rabbi Adin Steinsaltz