Men follow their sentiments ...

Men follow their sentiments and their self-interest, but it pleases them to imagine that they follow reason. And so they look for, and always find, some theory which, a posteriori, makes their actions appear to be logical. If that theory could be demolished scientifically, the only result would be that another theory would be substituted for the first one, and for the same purpose.
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 Vilfredo Pareto

Quotes from the same author

Human behaviour reveals uniformities which constitute natural laws. If these uniformities did not exist, then there would be neither social science nor political economy, and even the study of history would largely be useless. In effect, if the future actions of men having nothing in common with their past actions, our knowledge of them, although possibly satisfying our curiosity by way of an interesting story, would be entirely useless to us as a guide in life.
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 Vilfredo Pareto
Increase in the wealth per capita fosters democracy; but the latter, at least according to what we have been able to observe up to now, entails great destruction of wealth and even eventually dries up the sources of it. Hence it is its own grave-digger, it destroys what gave it birth.
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 Vilfredo Pareto
The sentiment that is very inappropriately named equality is fresh, strong, alert, precisely because it is not, in fact, a sentiment of equality and is not related to any abstraction, as a few naive "intellectuals" still believe; but because it is related to the direct interests of individuals who are bent on escaping certain inequalities not in their favour, and setting up new inequalities that will be in their favour, this latter being their chief concern.
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 Vilfredo Pareto
The assertion that men are objectively equal is so absurd that it does not even merit being refuted.
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 Vilfredo Pareto
In any series of elements to be controlled, a selected small fraction, in terms of numbers of elements, always accounts for a large fraction in terms of effect.
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 Vilfredo Pareto