With all our strength and with all our effort we must strive by humility to acquire for ourselves the good gift of sober-mindedness, which can preserve us unharmed by excess from both sides. For, as the Fathers say, the extremes from both sides are equally harmful—both excess of fasting and filling the belly, excess of vigil and excessive sleep, and other excesses.
— Saint John Cassian (c. 360-435)