Tormented by conflicting feelings, I appealed to reason; and it is reason which, amid so many dogmatic contradictions, now forces the hypothesis upon… - Pierre-Joseph Proudhon

I have found more peace in the knowledge of truth than anger in the feeling of oppression, and the most precious fruit that I could want to collect in this memoir would be to inspire my readers with that peace of mind arising from the clear perception of evil and its causes.

I have been pitiless in my criticism of the economists: for them I confess that, in general, I have no liking. The arrogance and the emptiness of their writings, their impertinent pride and their unwarranted blunders, have disgusted me. Whoever, knowing them, pardons them, may read them.

I live, like you, in a century in which reason submits only to fact and to evidence. My name, like yours, is TRUTH-SEEKER. My mission is written in these words of the law: Speak without hatred and without fear; tell that which thou knowest! The work of our race is to build the temple of science, and this science includes man and Nature. Now, truth reveals itself to all; to-day to Newton and Pascal, tomorrow to the herdsman in the valley and the journeyman in the shop. Each one contributes his stone to the edifice; and, his task accomplished, disappears. Eternity precedes us, eternity follows us: between two infinites, of what account is one poor mortal that the century should inquire about him?