"Man will never be free until the last king is strangled with the entrails of the last priest." [see comment]
"We swallow greedily any lie that flatters us, but we sip only little by little at a truth we find bitter."
"Reason is to the philosopher what grace is to the Christian... Other men walk in darkness; the philosopher, who has the same passions, acts only after reflection; he walks through the night, but it is preceded by a torch. The philosopher forms his principles on an infinity of particular observations. He does not confuse truth with plausibility; he takes for truth what is true, for forgery what is false, for doubtful what is doubtful, and probable what is probable. The philosophical spirit is thus a spirit of observation and accuracy."
"The arbitrary rule of a just and enlightened prince is always bad. His virtues are the most dangerous and the surest form of seduction: they lull a people imperceptibly into the habit of loving, respecting, and serving his successor, whoever that successor may be, no matter how wicked or stupid."
 More precisely: "And his hands would plait the priest's entrails, For want of a rope, to strangle kings."