A locution is a form of private revelation, similar to an apparition, but rather than being seen a locution is heard or received internally. As with all claims of private revelation it is important to be certain that a locution is authentic before any recognition or significance is determined.
The Catechism of the Catholic Church (CCC) explains:
Throughout the ages, there have been so-called “private” revelations, some of which have been recognized by the authority of the Church. They do not belong, however, to the deposit of faith. It is not their role to improve or complete Christ’s definitive Revelation, but to help live more fully by it in a certain period of history. Guided by the magisterium of the Church, the sensus fidelium knows how to discern and welcome in these revelations whatever constitutes an authentic call of Christ or his saints to the Church. Christian faith cannot accept “revelations” that claim to surpass or correct the Revelation of which Christ is the fulfillment, as is the case in certain non-Christian religions and also in certain recent sects which base themselves on such “revelations” (CCC 67).
The video above illustrates perfectly what a locution is all about.
I have had locutions from all persons of the Holy Trinity: one from the Father, two from Christ and several from the Holy Spirit. Yes, the source of the locution has identified itself, and the messages have been short and proactive. Both the source and the message have been clear and unequivocal, and the Holy Spirit has informed me that I am a finely tuned sink for His messages. Indeed, two preeminent mystics have independently identified me as a Messenger of the Holy Spirit for the End Times.
“Present the Gospel of Mark in segments for the people to enrich their knowledge about Christ in anticipation of the Illumination of Conscience.”