'Healthy' in the Bible

He must be devoted to the trustworthy message that agrees with what we teach, so that he may be able to encourage others with healthy doctrine and refute those who oppose it.

That statement is true. For this reason, refute them sharply so that they may become healthy in the faith

But as for you, teach what is consistent with healthy doctrine.

and healthy language which no one can censure, so that our opponents may feel ashamed at having nothing evil to say against us.