By tradition, the office of reading the Scriptures is a ministerial, not a presidential (Presider) function. The readings should be delivered by a lector, the Gospel being proclaimed by the deacon or by a priest other than the celebrant. If, however, a deacon or other priest is not present, the priest celebrant proclaims the Gospel. Further, if a suitable lector is not present, then the priest celebrant also delivers the other readings. After each reading, whoever does the reading proclaims the acclamation. Responding to it, the gathered people honor the word of God which they have received with faith and grateful hearts (GIRM 59).
The lector is instituted to proclaim the readings from Sacred Scripture, with the exception of the gospel reading. He may also announce the intentions for the General Intercessions and, in the absence of the psalmist, sing or read the psalm between the readings. In the celebration of the Eucharist, the lector has specific duties which he/she alone ought to perform, even though ordained ministers may be present. (GIRM 99)
In the absence of an instituted lector, other lay people may be designated to proclaim the readings from the Sacred Scriptures. Such designated lectors must be truly qualified and carefully prepared for this office, so that the faithful will develop a warm and lively love for Sacred Scripture from listening to the reading from the sacred texts. (GIRM 101)
When the Scriptures are read in the Church, God himself is speaking to His people, and Christ, present in His own Word, is proclaiming the gospel. The readings of God’s word must therefore be listened to by all with reverence; they make up a principal element of the liturgy. In the biblical readings, God’s word addresses all people of every era and is understandable to them, and a fuller understanding and efficacy are fostered by a living commentary on it, that is to say, by the homily, understood as an integral part of the liturgical. (GIRM 29)
In texts that are to be delivered in a loud and clear voice, whether by the priest or deacon or by the lector, or by all, the tone of voice should correspond to the genre of the text; i.e., accordingly as it is a reading, a prayer, an instruction, an acclamation, or a liturgical song; the tone should also be suited to the form of celebration and to the solemnity of the gathering. Other criteria are the idiom of different languages and the genius of peoples. (GIRM 38)