The effect of Torah learning on the soul above:^[1]

When a person studies Torah below in this world then his G-dly soul which is involved in the Torah study becomes truthfully united with the Torah which is one with G-d, and hence he becomes actually united with G-d. When a person invests his G-dly soul within Torah learning in this world than the root of his soul above also becomes invested within the Torah of above up until the highest of levels, and a complete unity takes place as a result.

[1] Torah Or p. 16a