Quotes from book
A World Restored

A World Restored: Metternich, Castlereagh and the Problems of Peace 1812-1822 is a book by Henry Kissinger that was published in 1954.

A World Restored: Metternich, Castlereagh and the Problems of Peace, 1812-22 (1957), p. 206
Paraphrased variant: The most fundamental problem of politics is not the control of wickedness but the limitation of righteousness.
Quoted by Walter Isaacson, " Henry Kissinger Reminds Us Why Realism Matters http://time.com/3275385/henry-kissinger/", Time, 4 September 2014
1950s