The use of the definite article in Spanish, such as with "cumplir los deseos", is influenced by the specific context and grammatical rules. In this case, "cumplir los deseos" involves a specific action of fulfilling wishes, where the definite article is used to refer to those particular wishes.

On the other hand, "con humildad y esperanza" employs a prepositional phrase describing the manner or attitude in which an action is performed, and in such cases, Spanish often omits the definite article. It's a matter of grammatical structure and the nuances of expression.

In summary, the choice of using or not using the definite article depends on the linguistic function of the phrase within the sentence, whether it denotes a specific entity (requiring the article) or describes a general quality or manner (where the article may be omitted).

I hope this explanation helps you out.

Cordialmente

Silvia