“…the power of this line [the cycloid] to measure time.”
Horologium Oscillatorium (1673) as quoted by Joella G. Yoder, "Christiaan Huygens, Book on the Pendulum Clock" in Landmark Writings in Western Mathematics 1640-1940 ed., Ivor Grattan-Guinness (2005)
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Christiaan Huygens 16
Dutch mathematician and natural philosopher 1629–1695Related quotes

Source: Understanding International Conflicts: An Introduction to Theory and History (6th ed., 2006), Chapter 3, Balance of Power and World War I, p. 61.

When asked what type of hitter he would consider himself to be. http://sports.ign.com/articles/709/709384p1.html

“The greatness of the man's power is the measure of his surrender.”

The scientific work of Georges Lemaître (1968), P.A.M. Dirac, Commentarii (Pontifical Academy of Sciences), vol 2, 11, pp. 1–18.

As quoted in The Farmer's Wife, Vol. 36 (1933), p. 72

“Power, like love, is easier to experience than to define or measure.”
Source: Understanding International Conflicts: An Introduction to Theory and History (6th ed., 2006), Chapter 3, Balance of Power and World War I, p. 60.