The seventh day is Shabbat, the seventh year is shemita. It's not difficult to see the connection between the symbol of the balances and the month of Tishrei, for the first day of Tishrei is Rosh Hashana, a day when the future of the world and all its inhabitants literally hangs in the balance. If he does one sin, he tips the balance of his own life and that of the whole world to the negative side. G-d communicates with us through the days, the months and the years. But because G-d has made the days, the months and the years the instruments of His Will, they are more imperishable and more accessible than any priest, monument or temple.
Priests die, monuments decay, temples and altars fall to pieces, but time remains forever.
A priest can minister to but a few. Monuments and temples require you to visit them. They do not wait for us to come to them. They come to us unannounced, and you cannot refuse them. Like children, they throw their arms around us and we cannot stop their holy embrace.