“Everything great glitters, glitter begets ambition, and ambition can easily have caused the inspiration or what we thought to be inspiration. But reason can no longer restrain one who is lured by the fury of ambition. He tumbles where his vehement drive calls him; no longer does he choose his position, but rather chance and luster determine it.
Then we are not called to the position where we can most shine. It is not the one which, in the long succession of years during which we may hold it, will never make us weary, subdue our zeal, or dampen our inspiration. Soon we shall see our wishes unfulfilled and our ideas unsatisfied.”
Writings of the Young Marx on Philosophy and Society, L. Easton, trans. (1967), p. 36
Reflections of a Youth on Choosing an Occupation (1835)
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Karl Marx 290
German philosopher, economist, sociologist, journalist and … 1818–1883Related quotes

After visiting such Nazi strongholds as were found in Berchtesgaden and Kehlsteinhaus; Personal diary (1 August 1945); published in Prelude to Leadership (1995)
Pre-1960

Helen Adams Keller (p. 60. Helen Keller's Journal: 1936-1937, Doubleday, Doran & company, inc., 1938)

The close of his Nobel lecture: "The Statistical Interpretations of Quantum Mechanics" (11 December 1954) http://nobelprize.org/nobel_prizes/physics/laureates/1954/born-lecture.html
Context: Can we call something with which the concepts of position and motion cannot be associated in the usual way, a thing, or a particle? And if not, what is the reality which our theory has been invented to describe?
The answer to this is no longer physics, but philosophy. … Here I will only say that I am emphatically in favour of the retention of the particle idea. Naturally, it is necessary to redefine what is meant. For this, well-developed concepts are available which appear in mathematics under the name of invariants in transformations. Every object that we perceive appears in innumerable aspects. The concept of the object is the invariant of all these aspects. From this point of view, the present universally used system of concepts in which particles and waves appear simultaneously, can be completely justified. The latest research on nuclei and elementary particles has led us, however, to limits beyond which this system of concepts itself does not appear to suffice. The lesson to be learned from what I have told of the origin of quantum mechanics is that probable refinements of mathematical methods will not suffice to produce a satisfactory theory, but that somewhere in our doctrine is hidden a concept, unjustified by experience, which we must eliminate to open up the road.

Writings of the Young Marx on Philosophy and Society, L. Easton, trans. (1967), p. 37
Reflections of a Youth on Choosing an Occupation (1835)

Cathy Collison (November 16, 1983) "Savitch Remembered Crim In Will", Detroit Free Press, p. 14D.

2015, Naturalization Ceremony speech (December 2015)