True conformity to the dictates of nature requires reverence for the past and solicitude for the future. 'Nature' is not simply the sensation of the passing moment; it is eternal, though we evanescent men experience only a fragment of it. We have no right to imperil the happiness of posterity by impudently tinkering with the heritage of humanity.
Ernesto Cardenal
Some liberation theologians maintain that they are not influenced by Marxist philosophy at all. In this case it is necessary to discern whether they say this for tactical reasons, so as not to be compromised politically or whether they are really convinced that Marxism doesn't influence them in any way. I personally think that it is not possible to evade the influence of Marxism, as we cannot commit ourselves to the revolutionary struggle without drawing support from the conclusions of scientific socialism.
