You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Heresy

Context:
According to Titus 3:10 a divisive person should be warned two times before separating from him. The Greek for the phrase "divisive person" became a technical term in the early Church for a type of "heretic" who promoted dissension. In contrast correct teaching is called sound not only because it builds up in the faith, but because it protects against the corrupting influence of false teachers.

Question:
What word is used when speaking of correct teachings in contrast to a false teacher?

sound