Someone once said to my father, "The Alter Rebbe's chassidim were always keeping count." My father took a great liking to the saying, and he commented: "That idea characterizes a person's service of G-d. The hours must be 'counted hours,' then the days will be 'counted days.' When a day passes one should know what he has accomplished and what remains yet to be done... In general, one should always see to it that tomorrow should be much better than today."
Rabbi Yosef Yitzchak of Lubavitch (Hayom Yom, Iyar 1)