Trying to give a simplified answer to a complex and fundamental question, Acharyas have addressed this in their philosophical treatises. Pardon my limitations here.
The jivatma's desire to enjoy sense objects is one of the reason mind exists. Mind is difficult to control because it gets habituated to the sense objects, and gets into a tangle of desires related to sense gratification. Quoting relevant verses from Gita.
In Gita 15.9 we find
The living entity, thus taking another gross body, obtains a certain type of ear, eye, tongue, nose and sense of touch, which are grouped about the mind. He thus enjoys a particular set of sense objects.
and in Gita 2.62, we find
While contemplating the objects of the senses, a person develops attachment for them, and from such attachment lust develops, and from lust anger arises.
and in Gita 16.12, we find,
Bound by a network of hundreds of thousands of desires and absorbed in lust and anger,
If the jivatma sincerely desires to serve Bhagavan, Krishna will definitely provide the needed help, and help orient the mind in that direction. There is abundant support in Shruti, Smriti and Acharyas for the "doctrine of grace" which is a large subject, hence I am not quoting those here.