Likutei Moharan 74:4/ליקוטי מוהר"ן ע״ד:ד׳

14. The indicator by which a person knows whether his aspect of judgment is impure or holy <is> prayer. [Judgment is holy] when it does not involve cessation of prayer. As our Sages, of blessed memory, taught: Which are the afflictions of love? Those [afflictions] that do not involve cessation of prayer; as it is said, “Blessed is the Lord Who has not turned away my prayer or His lovingkindness from me.” Prayer corresponds to the face, as it is written, “Chizkiyahu turned his face <to the wall> and prayed.” This is as it is written, “You concealed Your face; I was terrified.”