“A human being in perfection ought always to preserve a calm and peaceful mind and never to allow passion or a transitory desire to disturb his tranquility.”

“A human being in perfection ought always to preserve a calm and peaceful mind and never to allow passion or a transitory desire to disturb his tranquility. I do not think that the pursuit of knowledge is an exception to this rule. If the study to which you apply yourself has a tendency to weaken your affections and to destroy your taste for those simple pleasures in which no alloy can possibly mix, then that study is certainly unlawful, that is to say, not befitting the human mind. If this rule were always observed; if no man allowed any pursuit whatsoever to interfere with the tranquillity of his domestic affections, Greece had not been enslaved, Caesar would have spared his country, America would have been discovered more gradually, and the empires of Mexico and Peru had not been destroyed.”

“nothing contributes so much to tranquilize the mind as a steady purpose”

“It is a strange fact, but incontestable, that the philanthropist, who ardent in his desire to do good, who patient, reasonable and gentle, yet disdains to use other argument than truth, has less influence over men's minds than he who, grasping and selfish, refuses not to adopt any means, nor awaken any passion, nor diffuse any falsehood, for the advancement of his cause.”

“Nothing is more painful to the human mind than, after the feelings have been worked up by a quick succession of events, the dead calmness of inaction and certainty which follows and deprives the soul both of hope and fear.”

“For the first time, also, I felt what the duties of a creator toward his creature were, and that i ought to render him happy before I complained of his wickedness.”

“Had I right, for my own benefit, to inflict this curse upon everlasting generations? I had before been moved by the sophisms of the being I had created; I had been struck senseless by his fiendish threats; but now, for the first time, the wickedness of my promise burst upon me; I shuddered to think that future ages might curse me as their pest, whose selfishness had not hesitated to buy its own peace at the price, perhaps, of the existence of the whole human race.”