Authors:

Sober perseverance is more effective than enthusiastic emotions, which are all too capable of being transferred, with little difficulty, to something different each day.

"Disturbing the Peace: A Conversation with Karel Hvížďala". Book by Václav Havel, translated by Paul Wilson. Chapter 5: "The Politics of Hope", p. 111, 1990.
Sober perseverance is more effective than enthusiastic emotions, which are all too capable of being transferred, with little difficulty, to something different each day.