The ruling on making a vow in one's intention without verbalizing it

The listener Fahd 'Abd Allah Ba'islamah from Jeddah sent a message saying: What is your opinion regarding a person who said to himself, without speaking aloud, “If Allah wills, I will fast, and I will not stop except for a legal excuse that I cannot control,” but he stopped without an excuse? Does this count as a vow upon him, given that he said this without asking Allah for anything? That is, he did not say, “If you grant me success,” or “If Allah grants me success in a certain deed, I will fast,” but it was merely words in his mind. Please guide us on this matter. May Allah reward you with good.
Answer: This is not a vow, and he owes nothing, if the reality is as the questioner described.
The presenter: May Allah reward you with good.