To send men to the firing ...

To send men to the firing squad, judicial proof is unnecessary.  These procedures are an archaic bourgeois detail.  This is a revolution!  And a revolutionary must become a cold killing machine motivated by pure hate.
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 Che Guevara

Quotes from the same author

A revolutionary must become a cold killing machine motivated by pure hate. We must create the pedagogy of the paredón [execution wall].
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 Che Guevara
I am not interested in dry economic socialism. We are fighting against misery, but we are also fighting against alienation. One of the fundamental objectives of Marxism is to remove interest, the factor of individual interest, and gain, from people's psychological motivations. Marx was preoccupied both with economic factors and with their repercussions on the spirit. If communism isn't interested in this too, it may be a method of distributing goods, but it will never be a revolutionary way of life.
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 Che Guevara
The spectacular landscape circling the fortress supplies an essential backdrop, inspiring dreamers to wander its ruins for the sake of it; North American tourists, bound down by their practical world view, are able to place those members of the disintegrating tribes they may have seen in their travels among these once-living walls, unaware of the moral distance separating them, since only the semi-indigenous spirit of the South American can grasp the subtle differences.
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 Che Guevara
Above all, try always to be able to feel deeply any injustice committed against any person in any part of the world. It is the most beautiful quality of a revolutionary.
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 Che Guevara
There is no other definition of socialism valid for us than that of the abolition of the exploitation of man by man.
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 Che Guevara