Of course, it is very important to be sober when you take an exam. Many worthwhile careers in the street- cleansing, fruit-picking and subway-guitar-playing industries have been founded on a lack of understanding of this simple fact.
Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut.
Humanity has advanced, when it has advanced, not because it has been sober, responsible, and cautious, but because it has been playful, rebellious, and immature.
Adversity, if for no other reason, is of benefit, since it is sure to bring a season of sober reflection. People see clearer at such times. Storms purify the atmosphere.
All that is solid melts into air, all that is holy is profaned, and man is at last compelled to face with sober senses his real conditions of life, and his relations with his kind.
The moon looked like melted mozzarella to my bleary and blurry vision. Was I tired, intoxicated, or in love? Or was I sober, asleep, and alone?

Do not judge men by mere appearances; for the light laughter that bubbles on the lip often mantles over the depths of sadness, and the serious look may be the sober veil that covers a divine peace and joy.
A little learning is a dangerous thing; drink deep, or taste not the Pierian spring: there shallow draughts intoxicate the brain, and drinking largely sobers us again.
Almost nobody dances sober, unless they happen to be insane.