A Voice from the Past - Gregory the Great

But, on the other hand, those who understand indeed aright the words of the Law, but speak them not humbly, are to be admonished, that, in divine discourses, before they put them forth to others, they should examine themselves; lest in following up the deeds of others, they leave themselves behind; and lest, while while thinking rightly of all the rest of Holy Scripture, this only thing they attend not to, what is said in it against the proud. For he is indeed a poor and unskilful physician, who would fain heal another's disease while ignorant of that from which he himself is suffering.

Gregory the Great, 540-604 AD, Pastoral Rule, Part III, Chapter 24 (Nicene and Post Nicene Fathers Volume XII, Philip Schaff and Henry Wace, T & T Clark and Eerdmans, 1997, translator Rev. James Barmby, p. 52)

How great a problem is it to be right, but be proud about it? How do we avoid this?