As Marie Antoinette left Vienna, her mother, the Empress Maria Theresa decided to write a letter to her son-in-law, the dauphin Louis:
Your bride, my dear dauphin, has just left me. I do hope that she will cause your happiness. I have brought her up with the design that she should do so, because I have for some time forseen that she would share your destiny.
I have inspired her with an eager desire to do her duty to you, with a tender attachment to your person, with a resolution to be attentive to think and do every thing which may please you. I have also been most careful to enjoin her a tender devotion toward the Master of all Sovereigns, being thoroughly persuaded that we are but badly providing for the welfare of the nations which are intrusted to us when we fail in our duty to Him who breaks sceptres and overthrows thrones according to his pleasure.
I say, then, to you, my dear dauphin, as I say to my daughter: 'Cultivate your duties toward God. Seek to cause the happiness of the people over whom you will reign (it will be too soon, come when it may). Love the king, your grandfather; be humane like him; be always accessible to the unfortunate. If you behave in this manner, it is impossible that happiness can fail to be your lot.' My daughter will love you, I am certain, because I know her. But the more that I answer to you for her affection, and for her anxiety to please you, the more earnestly do I entreat you to vow to her the most sincere attachment.
Farewell, my dear dauphin. May you be happy. I am bathed in tears.
The Life of Marie Antoinette, Queen of France by Charles Duke Yonge