Luke 21:15

15 for *I* will give you a mouth and wisdom which all your opposers shall not be able to reply to or resist.

Luke 21:15 Meaning and Commentary

Luke 21:15

For I will give you a mouth
A faculty of speaking, a freedom of expression, a door of utterance, a good degree of elocution, to speak properly, pertinently and freely to any point: and wisdom;
to answer with great propriety, and in the most prudent manner, to any difficult and ensnaring question; and to furnish with such knowledge of the Gospel, and with such gifts and abilities to preach and defend it, that they should be able to give a clear and distinct account of it, and prove every point in it, by the most strong and convincing arguments, and vindicate it against all objections: which all your adversaries shall not be able to gainsay or resist.
This was remarkably fulfilled in Peter, and John, and in Stephen, ( Acts 4:13 Acts 4:14 ) ( 6:10 ) . The first word, "gainsay", is left out in the Syriac and Persic versions.

Luke 21:15 In-Context

13 but it shall turn out to you for a testimony.
14 Settle therefore in your hearts not to meditate beforehand [your] defence,
15 for *I* will give you a mouth and wisdom which all your opposers shall not be able to reply to or resist.
16 But ye will be delivered up even by parents and brethren and relations and friends, and they shall put to death [some] from among you,
17 and ye will be hated of all for my name's sake.
The Darby Translation is in the public domain.