Most fears people experience, and most worries, edginess, and depression a person experiences stem from one’s lack of thinking only of today.
When it is necessary for him to accomplish something, he postpones its completion for tomorrow, and tomorrow he postpones it for the following day, and so on, until he becomes indolent and does not wish to do anything at all.
Through this, everything he must do becomes laborious, for the unfinished business of yesterday collects itself to today, and it is impossible for him to do everything at once. Because of this he no longer has incentive to continue doing anything at all.
Only Today: Based on the Teachings of Rabbi Nachman of Breslov and of His Student Rabbi Nossan of Breslov, by Mohorosh HaKodesh Breslov