Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 21:12-19

“For because they were foolish and inexperienced, the Lord tells them this, that they might not be confounded when about to give account to the wise. And He adds the cause, For I will give you a mouth and wisdom, which all your adversaries shall not be able to gainsay or resist. As if He said, Ye shall forthwith receive of me eloquence and wisdom, so that all your adversaries, were they gathered together in one, shall not be able to resist you, neither in wisdom, that is, the power of the understanding, nor in eloquence, that is, excellence of speech, for many men have often wisdom in their mind, but being easily provoked to their great disturbance, mar the whole when their time of speaking comes, But not such were the Apostles, for in both these gifts they were highly favoured.”