One of the most central requirements of Jewish life—both in time and importance—is that of daily prayer. Yet most fascinatingly, the source of the obligation to pray—or whether such an obligation even exists—is a matter of great debate. It is the Rambam, and few (if any) others, who claim that there is a biblical obligation of daily prayer—and even such obligation is fulfilled by prayer once daily.
anshei knesset hagedolah
G-d is known as kel mistater, a hidden G-d (Yishayahu 46:15). Being created in His image, man, too, should yearn for anonymity. As Rav Soloveitchik notes, we know almost nothing about the members of the Anshei Knesset Hagedolah, those most responsible for setting up Jewish life as we know it today. Under their direction, the Oral Law became the focal point of Torah.