When I have occasionally set myself to consider the different distractions of men, the pains and perils to which they expose themselves at court or in war, whence arise so many quarrels, passions, bold and often bad ventures, etc., I have discovered that all the unhappiness of men arises from one single fact, that they cannot stay quietly in their own chamber.

Blaise Pascal (1623-1662) French scientist and philosopher

Pensées #139 “Diversion” (1670)
    (Source)

Alt. trans.: "I have often said that man's unhappiness springs from one thing alone, his incapacity to stay quietly in one room."

Alt. trans.: "All the trouble in the world is due to the fact that a man cannot sit still in a room."