She would never believe in the love of a man who should woo her as Princess Mary of Burgundy.
Her words came near accomplishing more than she desired.

When she stopped speaking, Max leaned forward and gently took her hand.
"Yolanda, this princess is nothing to me, and I swear to you that I will never ask her to marry--" A frightened gleam came to the girl's eyes when she understood the oath that Max was about to take, and she quickly placed her hand over his mouth.

Max was swearing too much.
"You shall not make that oath, Little Max," she said.

"You shall not say that you will never marry her, nor shall you say that you will never marry any one else.

You must remain free to choose the right wife when the right time comes.