"U-netaneh Tokef, a central prayer of the High Holy Days attributed to Rabbi Amnon of Mainz, focuses on themes of God's judgment, human powerlessness, and the eternal nature of God. The phrase 'ki-halom yauf' ('like a fleeting dream') within the prayer emphasizes the transitory nature of life and the significance of fleeting moments. The prayer's endurance through time is linked to a legend involving a dream and hints at the impact of seemingly insignificant actions. The High Holy Days, particularly Rosh Hashanah, discourage sleeping to emphasize active introspection and repentance over passive dreaming. The prayer underscores the importance of repentance, prayer, and charity in shaping one's fate."

The text delves into the significance of the U-netaneh Tokef prayer in the High Holy Days liturgy, focusing on the phrase "ki-halom yauf" (like a fleeting dream) as a central theme.