2725 Prayer is a gift of grace and a decisive response on our part. It always presupposes an effort. The great prayers of the Old Covenant before Christ, as well as the Mother of God and the saints with him teach us: prayer is a struggle. Against whom? Against ourselves and against the wiles of the tempter who does everything possible to divert man from prayer, from union with his God. One prays as one lives, because one lives as one prays. If one does not habitually act according to the Spirit of Christ, one cannot habitually pray in his name either. The "spiritual combat" of the Christian's new life is inseparable from the combat of prayer.

2765. The traditional expression 'Sunday Prayer' (i.e. 'Lord's Prayer') means that the prayer to our Father is taught and given to us by the Lord Jesus. This prayer that comes to us from Jesus is truly unique: it is "of the Lord". For on the one hand, with the words of this prayer, the only-begotten Son gives us the words that the Father gave him: he is the teacher of our prayer. On the other hand, Word incarnate, he knows in his human heart the needs of his brothers and sisters in humanity, and manifests them to us: he is the model of our prayer.

[Catechism of the Catholic Church]