Hence, charming Eugenia, you will allow mankind to think as they please, and judge of them after their actions. Oppose reason to their systems, when they are pernicious to themselves or others; remove their prejudices if you can, that they may not become the victims of their caprices; show them the truth, which may always remove error; banish from their minds the phantoms which disturb them; advise them not to meditate on the mysteries of their priests; bid them renounce all those illusions they have substituted for morality; and advise them to turn their thoughts on that which conduces to their happiness. Meditate yourself on your own nature, and the duties which it imposes on you. Fear those chastisements which follow inattention to this law. Be ambitious to be approved by your own understanding, and you will rarely fail to receive the applauses of the human kind, as a good member of society.
If you wish to meditate, think with the greatest strength of your mind on your nature. Never abandon the torch of reason; cherish truth sincerely. When you are in uncertainty, pause, or follow what appears the most probable, always abandoning opinions that are destitute of foundation, or evidence of their truth and benefit to society. Then will you, in good truth, yield to the impulse of your heart when reason is your guide; then will you consult in the calmness of passion, and counsel yourself on the advantages of virtue, and the consequences of its want; and you may flatter yourself that you cannot be displeasing to a wise God, though you disbelieve absurdities, nor agreeable to a good God in doing things hurtful to yourself or to others.
Leaving you now to your own reflections, I shall terminate the series of Letters you have allowed me to address you. Bidding you an affectionate farewell, I am truly yours.