145. That which the Holy One Blessed He does not heed the prayer of the tzaddik, (it is) in order to thus reject the evildoers, that they should remain in their wickedness. (t.n. A possible explanation for this cause and effect can be made based on Likutay Moharan Torah 70 that the tzaddik is like the Earth and all of creation gravitates towards him but there are forces that repel gravity see the teaching at length, so it is possible that when G-d doesn't heed the tzaddik's prayer this is a general repellant against his magnetism, and thus the wicked will not be drawn to the tzaddik and will remain in their wickedness. As far as the concept of rejecting the wicked from repentance, this is found in numerous places such as by Pharoah and Korach – see the commentaries there).