In the emotions, there is a greater mix of evil with good than there is in intellect.
Of course, intellect can serve evil purposes; but intrinsically, as an abstract quality, it is not associated with evil.
It can remain a neutral entity connected neither to good nor to evil.
By contrast, almost intrinsically, emotions are directed either to good or to evil.
There is no undifferentiated, nondirected love.
Love is almost necessarily a choice between one thing and the other, between one side and another.
Thus, it also chooses which world to enter and become a part of.
–Rabbi Adin Steinsaltz