Anatol Rapoport, "An Essay on Mind". Reprinted in Toward Definition of Mind (Jordan Ma Scher, editor). Glencoe, Illinois: Free Press, 1962. p. 92
1960s
“The beginnings will not be easy; they shall be extremely difficult.”
Message to the Tricontinental (1967)
Context: The beginnings will not be easy; they shall be extremely difficult. All the oligarchies' powers of repression, all their capacity for brutality and demagoguery will be placed at the service of their cause. Our mission, in the first hour, shall be to survive; later, we shall follow the perennial example of the guerilla, carrying out armed propaganda … the great lesson of the invincibility of the guerrillas taking root in the dispossessed masses; the galvanizing of the national spirit, the preparation for harder tasks, for resisting even more violent repressions. Hatred as an element of the struggle; a relentless hatred of the enemy, impelling us over and beyond the natural limitations that man is heir to and transforming him into an effective, violent, selective and cold killing machine. Our soldiers must be thus; a people without hatred cannot vanquish a brutal enemy.
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Ernesto Che Guevara 258
Argentine Marxist revolutionary 1928–1967Related quotes

“Moderation, we find, is an extremely difficult thing to get in this country.”
Source: The Best of Myles (1968)

Nobel Address (1991)
Context: I am an optimist and I believe that together we shall be able now to make the right historical choice so as not to miss the great chance at the turn of centuries and millenia and make the current extremely difficult transition to a peaceful world order. A balance of interests rather than a balance of power, a search for compromise and concord rather than a search for advantages at other people's expense, and respect for equality rather than claims to leadership — such are the elements which can provide the groundwork for world progress and which should be readily acceptable for reasonable people informed by the experience of the twentieth century.
The future prospect of truly peaceful global politics lies in the creation through joint efforts of a single international democratic space in which States shall be guided by the priority of human rights and welfare for their own citizens and the promotion of the same rights and similar welfare elsewhere. This is an imperative of the growing integrity of the modern world and of the interdependence of its components.

“Every beginning is difficult, holds in all sciences.”
Author's prefaces to the First Edition.
(Buch I) (1867)

From a 1903 letter to President Roosevelt, John Hay Papers, Library of Congress.

Book I, v, 8
The Advancement of Learning (1605)
Source: The Advancement Of Learning
Context: The two ways of contemplation are not unlike the two ways of action commonly spoken of by the ancients: the one plain and smooth in the beginning, and in the end impassable; the other rough and troublesome in the entrance, but after a while fair and even. So it is in contemplation: If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties.