I am a great fan of Cardinal Sarah. Lately I've been using his book The Power of Silence for reading during Eucharistic adoration, and find that is helps me stay focused and aware of why I'm there. I also reflected on Cardinal Sarah's insights while attending an Extraordinary form mass last week. (I've always been a bit hyperactive and so, while appreciating the EF mass in principle I sometimes find it difficult to get through in practice.) So I'm taking what Cardinal Sarah says seriously, and thought we could discuss it here.
His remarks about breviary apps were a tiny part of a much longer speech given recently to the Roman Forum on Summorum Pontificum. The whole speech is worth reading, but for our purposes we want to read at least this paragraph, where he says that, when we embark on liturgical prayer:
Secondly, I must—somehow—manage to put aside, even if this must be temporary, the world and its constant demands. I cannot participate fully and fruitfully in the Sacred Liturgy if my focus is elsewhere. We all benefit from the advances of modern technology, but the many (maybe too many?) technological devices upon which we rely can enslave us in a constant stream of communication and demands for instant responses. We must leave this behind if we are to celebrate the liturgy properly. Perhaps it is very practical and convenient to pray the breviary with my own mobile phone or tablet or another electronic device, but it is not worthy: it desacralizes prayer. These apparatuses are not instruments consecrated and reserved to God, but we use them for God and also for profane things! Electronic devices must be turned off, or better still they can be left behind at home when we come to worship God. I have spoken previously of the unacceptability of taking photographs at the Sacred Liturgy, and of the particular scandal that this gives when it is done by clergy vested for liturgical service. We cannot focus on God if we are busy with something else. We cannot hear God speaking to us if we are already occupied communicating with someone else, or behaving as a photographer.